In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4736-1 advisory.

    Update to Mozilla Thunderbird 153.5 (MFSA 2026-110, bsc#1284493):

    - CVE-2026-109704: Privilege escalation in the Application Update component.
    - CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-     free in the       Networking component.
    - CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
    - CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
    - CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
    - CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing     component.
    - CVE-2026-109710: Use-after-free in the Graphics: Text component.
    - CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
    - CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
    - CVE-2026-109713: Use-after-free in the Crash Reporting component.
    - CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
    - CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
    - CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
    - CVE-2026-109718: Use-after-free in the XML component.
    - CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
    - CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
    - CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
    - CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
    - CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
    - CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
    - CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
    - CVE-2026-109726: Use-after-free in the SVG component.
    - CVE-2026-109727: Use-after-free in the Audio/Video component.
    - CVE-2026-109728: Use-after-free in the DOM: Animation component.
    - CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
    - CVE-2026-109730: Integer overflow in the Graphics component.
    - CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
    - CVE-2026-109732: Use-after-free in the DOM: Streams component.
    - CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
    - CVE-2026-109734: Mitigation bypass in the DOM: Security component.
    - CVE-2026-109736: Frame poisoning in the Layout component.
    - CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
    - CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
    - CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
    - CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
    - CVE-2026-109742: Information disclosure in the PDF Viewer component.
    - CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
    - CVE-2026-109744: Other issue in the DOM: File component.
    - CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
    - CVE-2026-109751: Information disclosure in the Networking component.
    - CVE-2026-109752: Use-after-free in the DOM: Workers component.
    - CVE-2026-109753: Incorrect boundary conditions in the Layout component.
    - CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
    - CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
    - CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
    - CVE-2026-109759: Site isolation issue in the Networking component.
    - CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
    - CVE-2026-109762: Incorrect boundary conditions in the SVG component.
    - CVE-2026-109763: Mitigation bypass in the File Handling component.
    - CVE-2026-109764: Mitigation bypass in the Enterprise Policies component.
    - CVE-2026-109765: Race condition, use-after-free in the Graphics: Text component.
    - CVE-2026-109766: Mitigation bypass in the Enterprise Policies component.
    - CVE-2026-109767: Information disclosure in the Networking component.
    - CVE-2026-109770: Spoofing issue in the DOM: Web Serial component.
    - CVE-2026-109775: Denial-of-service in the WebRTC component.
    - CVE-2026-109776: Race condition in the XPCOM component.
    - CVE-2026-109777: Information disclosure in the Storage: IndexedDB component.
    - CVE-2026-109778: Privilege escalation in the WebExtensions component.
    - CVE-2026-109781: Denial-of-service in the Printing: Output component.
    - CVE-2026-109782: Mitigation bypass in the File Handling component.
    - CVE-2026-109783: Mitigation bypass in the File Handling component.
    - CVE-2026-110249: Denial-of-service in the Exchange email component.

    libexpat updated:

    - CVE-2026-50219: libexpat: Use-after-free vulnerability due to lack of handler call depth tracking in     libexpat could lead to information disclosure, integrity loss, or denial of service (bsc#1275108).
    - CVE-2026-56131: libexpat: Use-after-free vulnerability due to a lack of handler call depth tracking for     XML_ResumeParser in libexpat could lead to denial of service (bsc#1275108).
    - CVE-2026-56132: libexpat: Heap buffer overflow in doProlog due to mishandled array reallocation in     libexpat could lead to denial of service or memory corruption (bsc#1275108).
    - CVE-2026-56403: libexpat: Integer overflow vulnerability in the storeAtts attribute parsing function in     libexpat could lead to memory corruption (bsc#1275108).
    - CVE-2026-56404: libexpat: Integer overflow vulnerability in the addBinding routine of libexpat could     lead to memory corruption and potential security risks (bsc#1275108).
    - CVE-2026-56405: libexpat: Integer overflow vulnerability in libexpat could lead to memory corruption or     denial of service (bsc#1275108).
    - CVE-2026-56406: libexpat: Integer overflow vulnerability in libexpat could lead to memory corruption or     denial of service (bsc#1275108).
    - CVE-2026-56407: libexpat: Integer overflow vulnerability in libexpat could lead to memory corruption or     denial of service (bsc#1275108).
    - CVE-2026-56408: libexpat: Integer overflow vulnerability in the copyString function in libexpat could     lead to memory corruption (bsc#1275108).
    - CVE-2026-56409: libexpat: Integer overflow vulnerability in libexpat could lead to memory corruption or     denial of service (bsc#1275108).
    - CVE-2026-56410: libexpat: Integer overflow vulnerability in the xmlwf utility of libexpat could lead to     denial of service (bsc#1275108).
    - CVE-2026-56411: libexpat: Integer overflow vulnerability in libexpat could lead to memory corruption or     denial of service (bsc#1275108).
    - CVE-2026-56412: libexpat: Use-after-free vulnerability due to a lack of handler call depth tracking in     libexpat could lead to denial of service or memory corruption (bsc#1275108).
    - CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in     the storeAtts() function in xmlparse.c (bsc#1275736).
    - CVE-2026-72522: libexpat: Out-of-bounds read and resultant infinite loop in the Unicode processing     functions in libexpat allowed attackers to cause denial of service (bsc#1275605).
    - CVE-2026-76641: libexpat: Out-of-bounds read vulnerability caused by a struct size mismatch in libexpat     allowed attackers to trigger memory corruption or a crash (bsc#1275736).
    - CVE-2026-76956: libexpat: Insufficient entropy caused by misinterpretation of getentropy's return code     in libexpat allowed attackers to cause a denial of service via hash flooding attacks (bsc#1275736).
    - CVE-2026-76957: libexpat: Use-after-free vulnerability due to lack of handler call depth tracking with     custom encoding callbacks in libexpat could lead to memory corruption (bsc#1275736).
    - CVE-2026-93990: libexpat: Improper handling of lone high surrogates in UTF-16 encoded XML in libexpat     allowed attackers to pass unpaired surrogates or silently replace input characters (bsc#1282347).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6566 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6566-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     October 16, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : expat     CVE ID         : CVE-2026-66046 CVE-2026-76956 CVE-2026-76957 CVE-2026-77214                      CVE-2026-93990 CVE-2026-102633     Debian Bug     : 1144925 1144926 1144927 1148665 1149507 1150320

    Several vulnerabilities have been discovered in Expat, an XML parsing C     library, which could result in denial of service or potentially the     execution of arbitrary code, if a malformed XML file is processed.

    For the stable distribution (trixie), these problems have been fixed in     version 2.9.0-1~deb13u1.

    We recommend that you upgrade your expat packages.

    For the detailed security status of expat please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/expat

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4615-1 advisory.

    - CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents     (bsc#1249584).
    - CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to     copy the       encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser     (bsc#1257144).
    - CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
    - CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an     entity       declaration value (bsc#1259726).
    - CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
    - CVE-2026-32778: NULL pointer dereference in `setContext` on retry after an out-of-memory condition       (bsc#1259729).
    - CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
    - CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
    - CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in     cases of a       policy violation (bsc#1267631).
    - CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within       handlers in cases of a policy violation (bsc#1268572).
    - CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
    - CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406,       CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410,       CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
    - CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the     storeAtts()       function (bsc#1275732).
    - CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the     same       as high surrogates during Unicode processing (bsc#1275594).
    - CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger       memory corruption (bsc#1275915).
    - CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
    - CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use-       after-free can occur (bsc#1275859).
    - CVE-2026-77214: out-of-bounds read due to insufficient checks in `XML_ParseBuffer()` (bsc#1284334).
    - CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input     (bsc#1282347).
    - CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

    Update to 2.8.5 (jsc#PED-16154):

     * Bug fixes:
     * Fix an OOM-related memory leak on a failed overflow check
     * Fix memory alignment for architectures with 128bit pointers
     * Mark XML_SetHashSalt deprecated
     * CMake: only add /source-charset:utf-8 when /utf-8 is not present
     * lib: resolve undefined behavior from overshifting a signed int
     * lib: support read-only hash table lookup with non-zero-terminated      keys
     * lib: use a C99 bool for ENTITY.open
     * version info bumped from 13:3:12 to 13:4:12
     * fix support for 2+ GiB documents (regression from 2.8.2)
     * reject empty version in the XML declaration
     * fix printf format for AIX
     * CMake|AIX: enable EXPAT_DEV_URANDOM by default
     * version info bumped from 13:2:12 to 13:3:12
     * Existing API function XML_SetHashSalt is now deprecated
     * because of its limitations, and its use should be
     * considered a vulnerability. Please either use the new API
     * function XML_SetHashSalt16Bytes (with known-high-quality
     * entropy input only!) instead, or leave the derivation of
     * a 16-bytes hash salt from high quality entropy to Expat's
     * internal machinery (by *not* calling either of the two
     * XML_SetHashSalt* functions).
     * xmlwf: Fix a memory leak
     * WASI: Fix format specifiers for 32bit WASI SDK
     * Fix alignment of internal allocations for some non-amd64      architectures (e.g. sparc32); fixes up on the fix to      CVE-2025-59375 (of Expat 2.7.2)
     * Fix a class of false positives where input should have been      rejected with error XML_ERROR_ASYNC_ENTITY; regression from      CVE-2024-8176 (of Expat 2.7.0)
     * Prove and regression-proof absence of integer overflow      from function expat_realloc
     * Remove 'harmless' cast that truncated a size_t to unsigned
     * xmlwf: Resolve use of functions XML_GetErrorLineNumber      and XML_GetErrorColumnNumber
     * CVE-2025-59375 -- Disallow use of disproportional amounts of      dynamic memory from within an Expat parser
     * xmlwf: Fix (internal) help generator
     * xmlwf: Mention supported environment variables in

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4619-1 advisory.

    - CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents     (bsc#1249584).
    - CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to     copy the       encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser     (bsc#1257144).
    - CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
    - CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an     entity       declaration value (bsc#1259726).
    - CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
    - CVE-2026-32778: NULL pointer dereference in `setContext` on retry after an out-of-memory condition       (bsc#1259729).
    - CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
    - CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
    - CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in     cases of a       policy violation (bsc#1267631).
    - CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within       handlers in cases of a policy violation (bsc#1268572).
    - CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
    - CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406,       CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410,       CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
    - CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the     storeAtts()       function (bsc#1275732).
    - CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the     same       as high surrogates during Unicode processing (bsc#1275594).
    - CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger       memory corruption (bsc#1275915).
    - CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
    - CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use-       after-free can occur (bsc#1275859).
    - CVE-2026-77214: out-of-bounds read due to insufficient checks in `XML_ParseBuffer()` (bsc#1284334).
    - CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input     (bsc#1282347).
    - CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

    Update to 2.8.5 (jsc#PED-16154):

     * Bug fixes:
     * Fix an OOM-related memory leak on a failed overflow check
     * Fix memory alignment for architectures with 128bit pointers
     * Mark XML_SetHashSalt deprecated
     * CMake: only add /source-charset:utf-8 when /utf-8 is not present
     * lib: resolve undefined behavior from overshifting a signed int
     * lib: support read-only hash table lookup with non-zero-terminated      keys
     * lib: use a C99 bool for ENTITY.open
     * version info bumped from 13:3:12 to 13:4:12
     * fix support for 2+ GiB documents (regression from 2.8.2)
     * reject empty version in the XML declaration
     * fix printf format for AIX
     * CMake|AIX: enable EXPAT_DEV_URANDOM by default
     * version info bumped from 13:2:12 to 13:3:12
     * Existing API function XML_SetHashSalt is now deprecated
     * because of its limitations, and its use should be
     * considered a vulnerability. Please either use the new API
     * function XML_SetHashSalt16Bytes (with known-high-quality
     * entropy input only!) instead, or leave the derivation of
     * a 16-bytes hash salt from high quality entropy to Expat's
     * internal machinery (by *not* calling either of the two
     * XML_SetHashSalt* functions).
     * xmlwf: Fix a memory leak
     * WASI: Fix format specifiers for 32bit WASI SDK
     * Fix a class of false positives where input should have been        rejected with error XML_ERROR_ASYNC_ENTITY; regression from        earlier security fix (of Expat 2.7.0)
     * Prove and regression-proof absence of integer overflow      from function expat_realloc
     * Remove 'harmless' cast that truncated a size_t to unsigned
     * xmlwf: Resolve use of functions XML_GetErrorLineNumber        and XML_GetErrorColumnNumber
     * CVE-2025-59375 -- Disallow use of disproportional amounts of        dynamic memory from within an Expat parser
     * xmlwf: Fix (internal) help generator
     * xmlwf: Mention supported environment variables in

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4623-1 advisory.

    - CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents     (bsc#1249584).
    - CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to     copy the       encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser     (bsc#1257144).
    - CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
    - CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an     entity       declaration value (bsc#1259726).
    - CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
    - CVE-2026-32778: NULL pointer dereference in `setContext` on retry after an out-of-memory condition       (bsc#1259729).
    - CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
    - CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
    - CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in     cases of a       policy violation (bsc#1267631).
    - CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within       handlers in cases of a policy violation (bsc#1268572).
    - CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
    - CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406,       CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410,       CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
    - CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the     storeAtts()       function (bsc#1275732).
    - CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the     same       as high surrogates during Unicode processing (bsc#1275594).
    - CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger       memory corruption (bsc#1275915).
    - CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
    - CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use-       after-free can occur (bsc#1275859).
    - CVE-2026-77214: out-of-bounds read due to insufficient checks in `XML_ParseBuffer()` (bsc#1284334).
    - CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input     (bsc#1282347).
    - CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

    Update to 2.8.5 (jsc#PED-16154):

     * Bug fixes:
     * Fix an OOM-related memory leak on a failed overflow check
     * Fix memory alignment for architectures with 128bit pointers
     * Mark XML_SetHashSalt deprecated
     * CMake: only add /source-charset:utf-8 when /utf-8 is not present
     * lib: resolve undefined behavior from overshifting a signed int
     * lib: support read-only hash table lookup with non-zero-terminated      keys
     * lib: use a C99 bool for ENTITY.open
     * version info bumped from 13:3:12 to 13:4:12
     * fix support for 2+ GiB documents (regression from 2.8.2)
     * reject empty version in the XML declaration
     * fix printf format for AIX
     * CMake|AIX: enable EXPAT_DEV_URANDOM by default
     * version info bumped from 13:2:12 to 13:3:12
     * Existing API function XML_SetHashSalt is now deprecated
     * because of its limitations, and its use should be
     * considered a vulnerability. Please either use the new API
     * function XML_SetHashSalt16Bytes (with known-high-quality
     * entropy input only!) instead, or leave the derivation of
     * a 16-bytes hash salt from high quality entropy to Expat's
     * internal machinery (by *not* calling either of the two
     * XML_SetHashSalt* functions).
     * xmlwf: Fix a memory leak
     * WASI: Fix format specifiers for 32bit WASI SDK
     * Fix alignment of internal allocations for some non-amd64      architectures (e.g. sparc32); fixes up on the fix to      CVE-2025-59375 (of Expat 2.7.2)
     * Fix a class of false positives where input should have been      rejected with error XML_ERROR_ASYNC_ENTITY; regression from      CVE-2024-8176 (of Expat 2.7.0)
     * Prove and regression-proof absence of integer overflow      from function expat_realloc
     * Remove 'harmless' cast that truncated a size_t to unsigned
     * xmlwf: Resolve use of functions XML_GetErrorLineNumber      and XML_GetErrorColumnNumber
     * CVE-2025-59375 -- Disallow use of disproportional amounts of      dynamic memory from within an Expat parser
     * xmlwf: Fix (internal) help generator
     * xmlwf: Mention supported environment variables in

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to
    insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of
    service via crafted XML content. (CVE-2026-76956)

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:23912-1 advisory.

    - CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
    - CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision     checks allows a       denial of service via moderately sized crafted XML input (bsc#1264713).
    - CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer,     XML_Parse,       XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation     (bsc#1267631).
    - CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser     from within       handlers in cases of a policy violation (bsc#1268572).
    - CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based     buffer       overflows (bsc#1268573).
    - CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential     arbitrary code       execution (bsc#1275096).
    - CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations,     memory       corruption, and application crashes (bsc#1275096).
    - CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and     arbitrary       code execution (bsc#1275096).
    - CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory     corruption, and       application crashes (bsc#1275096).
    - CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption     and denial       of service (bsc#1275096).
    - CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and     application crashes       (bsc#1275096).
    - CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer     corruption and       arbitrary file write conditions (bsc#1275096).
    - CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory     corruption, information       disclosure, and potential code execution (bsc#1275096).
    - CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory     corruption and       denial of service (bsc#1275096).
    - CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free       conditions and arbitrary code execution (bsc#1275096).
    - CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in     the       storeAtts() function in xmlparse.c (bsc#1275732).
    - CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being     treated the same       as high surrogates during Unicode processing (bsc#1275594).
    - CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers     to trigger       memory corruption (bsc#1275915).
    - CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code     leads to       insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of     service via       crafted X (bsc#1275860).
    - CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks.
    (bsc#1275859).

    Changes for expat:

    - Updated to version 2.8.4

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21945-1 advisory.

    - CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
    - CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision     checks allows a       denial of service via moderately sized crafted XML input (bsc#1264713).
    - CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer,     XML_Parse,       XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation     (bsc#1267631).
    - CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser     from within       handlers in cases of a policy violation (bsc#1268572).
    - CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based     buffer       overflows (bsc#1268573).
    - CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential     arbitrary code       execution (bsc#1275096).
    - CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations,     memory       corruption, and application crashes (bsc#1275096).
    - CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and     arbitrary       code execution (bsc#1275096).
    - CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory     corruption, and       application crashes (bsc#1275096).
    - CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption     and denial       of service (bsc#1275096).
    - CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and     application crashes       (bsc#1275096).
    - CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer     corruption and       arbitrary file write conditions (bsc#1275096).
    - CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory     corruption, information       disclosure, and potential code execution (bsc#1275096).
    - CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory     corruption and       denial of service (bsc#1275096).
    - CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free       conditions and arbitrary code execution (bsc#1275096).
    - CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in     the       storeAtts() function in xmlparse.c (bsc#1275732).
    - CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being     treated the same       as high surrogates during Unicode processing (bsc#1275594).
    - CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers     to trigger       memory corruption (bsc#1275915).
    - CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code     leads to       insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of     service via       crafted X (bsc#1275860).
    - CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks.
    (bsc#1275859).

    Changes for expat:

    - Updated to version 2.8.4

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-5660612c34 advisory.

    Update to expat-2.8.4.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4a2ee61320 advisory.

    Update to expat-2.8.4.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-9e9244744d advisory.

    Update to expat-2.8.4.

    ----

    Update to expat-2.8.3.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity
    in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized
    values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote
    unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application
    parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring
    authentication, external entity resolution, or non-default parser options. (CVE-2026-66046)

  - Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory
    corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A
    struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past
    allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a
    wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for
    CVE-2026-66046. (CVE-2026-76641)

  - In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to
    insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of
    service via crafted XML content. (CVE-2026-76956)

  - libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-
    free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
    (CVE-2026-76957)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to     insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of     service via crafted XML content. (CVE-2026-76956)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
367746	SUSE SLED15: MozillaThunderbird / MozillaThunderbird-translations-common / etc (SUSE-SU-2026:4736-1)	Nessus	SuSE Local Security Checks	Local	high
366409	Debian dsa-6566 : expat - security update	Nessus	Debian Local Security Checks	Local	high
365325	SUSE SLES12 Security Update : expat (SUSE-SU-2026:4615-1)	Nessus	SuSE Local Security Checks	Local	high
365321	SUSE SLED15 / SLES15 Security Update : expat (SUSE-SU-2026:4619-1)	Nessus	SuSE Local Security Checks	Local	high
365317	SUSE SLES15 Security Update : expat (SUSE-SU-2026:4623-1)	Nessus	SuSE Local Security Checks	Local	high
459021	Echo: expat: security update to 2.8.4-1	Tenable Cloud Security	Echo Local Security Checks	Local	high
459021	Echo: expat: security update to 2.8.4-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
351397	SUSE SLES16 Security Update : expat (SUSE-SU-2026:23912-1)	Nessus	SuSE Local Security Checks	Local	high
350766	openSUSE 16 Security Update : expat (openSUSE-SU-2026:21945-1)	Nessus	SuSE Local Security Checks	Local	high
344990	Fedora 44 : mingw-expat (2026-5660612c34)	Nessus	Fedora Local Security Checks	Local	high
344988	Fedora 43 : mingw-expat (2026-4a2ee61320)	Nessus	Fedora Local Security Checks	Local	high
344891	Fedora 45 : mingw-expat (2026-9e9244744d)	Nessus	Fedora Local Security Checks	Local	high
447379	Alpine: libexpat, multiple expat packages: security update to 2.8.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
447379	Alpine: libexpat, multiple expat packages: security update to 2.8.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
338289	Linux Distros Unpatched Vulnerability : CVE-2026-76956	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-76956

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high