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.

According to the versions of the expat packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    libexpat before 2.8.2 has an integer overflow in getAttributeId.(CVE-2026-56405)

    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)

    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.
    Thus, a use-after-free can occur,(CVE-2026-50219)

    xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is     used.(CVE-2026-56409)

    libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was     present in XML_Parse.(CVE-2026-56406)

    libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call     depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-     free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.(CVE-2026-56412)

    xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION     declarations.(CVE-2026-56411)

    libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity     textLen.(CVE-2026-56407)

    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)

    libexpat before 2.8.2 has an integer overflow in storeAtts.(CVE-2026-56403)

    libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers     in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219     situation).(CVE-2026-56131)

    libexpat before 2.8.2 has an integer overflow in addBinding.(CVE-2026-56404)

    libexpat before 2.8.2 has an integer overflow in copyString.(CVE-2026-56408)

    In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold     backing array reallocation is mishandled when there is data-structure sharing across     parsers.(CVE-2026-56132)

    xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.(CVE-2026-56410)

    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)

Tenable has extracted the preceding description block directly from the EulerOS expat 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-2026:4736-1 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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6666907a26 advisory.

    Update to expat-2.8.2.

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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1900 advisory.

    In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold     backing array reallocation is mishandled when there is data-structure sharing across parsers.
    (CVE-2026-56132)

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

Note that Nessus has not tested for this issue 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-6404 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6404-1                   security@debian.org     https://www.debian.org/security/                                  Aron Xu     July 30, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : expat     CVE ID         : CVE-2025-59375 CVE-2026-24515 CVE-2026-25210 CVE-2026-32776                      CVE-2026-32777 CVE-2026-32778 CVE-2026-41080 CVE-2026-45186                      CVE-2026-50219 CVE-2026-56131 CVE-2026-56132 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 security issues were discovered in expat, an XML parsing C library,     including integer overflows, out-of-bounds write, NULL pointer dereferences,     excessive resource consumption, and memory corruption through re-entrant     parser API calls, which may result in denial of service or potentially the     execution of arbitrary code.

    For the stable distribution (trixie), this problem has been fixed in     version 2.8.2-1~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.

According to the versions of the expat packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was     present in XML_Parse.(CVE-2026-56406)

    libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity     textLen.(CVE-2026-56407)

    xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION     declarations.(CVE-2026-56411)

    libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call     depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-     free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.(CVE-2026-56412)

    xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is     used.(CVE-2026-56409)

    libexpat before 2.8.2 has an integer overflow in getAttributeId.(CVE-2026-56405)

    In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold     backing array reallocation is mishandled when there is data-structure sharing across     parsers.(CVE-2026-56132)

    libexpat before 2.8.2 has an integer overflow in copyString.(CVE-2026-56408)

    xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.(CVE-2026-56410)

    libexpat before 2.8.2 has an integer overflow in addBinding.(CVE-2026-56404)

    libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers     in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219     situation).(CVE-2026-56131)

    libexpat before 2.8.2 has an integer overflow in storeAtts.(CVE-2026-56403)

Tenable has extracted the preceding description block directly from the EulerOS expat 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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:64809 advisory.

    * expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking     (CVE-2026-50219)

    * expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

Tenable has extracted the preceding description block directly from the RockyLinux 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 MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1805:10 advisory.

    * expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking     (CVE-2026-50219)
      * expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

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

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

ID	Name	Product	Family	Published	Updated	Severity
350766	openSUSE 16 Security Update : expat (openSUSE-SU-2026:21945-1)	Nessus	SuSE Local Security Checks	9/26/2026	10/26/2026	high
365073	EulerOS 2.0 SP13 : expat (EulerOS-SA-2026-4135)	Nessus	Huawei Local Security Checks	10/12/2026	10/26/2026	high
367746	SUSE SLED15: MozillaThunderbird / MozillaThunderbird-translations-common / etc (SUSE-SU-2026:4736-1)	Nessus	SuSE Local Security Checks	10/20/2026	10/23/2026	high
325282	Fedora 43 : mingw-expat (2026-6666907a26)	Nessus	Fedora Local Security Checks	7/6/2026	7/15/2026	medium
327376	Amazon Linux 2023 : expat, expat-devel, expat-static (ALAS2023-2026-1900)	Nessus	Amazon Linux Local Security Checks	7/16/2026	7/16/2026	medium
330837	Debian dsa-6404 : expat - security update	Nessus	Debian Local Security Checks	7/30/2026	7/30/2026	high
364091	EulerOS 2.0 SP15 : expat (EulerOS-SA-2026-3908)	Nessus	Huawei Local Security Checks	10/8/2026	10/26/2026	medium
344066	RockyLinux 8 : expat (RLSA-2026:64809)	Nessus	Rocky Linux Local Security Checks	9/9/2026	10/27/2026	medium
344585	MiracleLinux 8 : expat-2.5.0-2.el8_10.2 (AXSA:2026-1805:10)	Nessus	Miracle Linux Local Security Checks	9/10/2026	10/27/2026	medium

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