A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.

The remote Ubuntu 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8460-1 advisory.

    It was discovered that libxml2 did not properly release memory allocated in the xmllint utility. An     attacker could possibly use this issue to cause a denial of service. (CVE-2026-1757)

    A type confusion vulnerability was found in libxml2 when processing a specially crafted XML document. A     remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-6732)

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

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

An update of the libxml2 package has been released.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4622 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4622-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     June 08, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libxml2     Version        : 2.9.10+dfsg-6.7+deb11u10     CVE ID         : CVE-2025-8732 CVE-2026-0989 CVE-2026-0990 CVE-2026-0992                      CVE-2026-1757     Debian Bug     : 1125691 1125695 1125696

    Multiple security issues were found in libxml2, the GNOME XML library,     which could lead to Denial of Service.

    CVE-2025-8732

        Catalog parsing functions were missing cycle detection.  When a         catalog file contains a CATALOG directive pointing to itself,         `xmlExpandCatalog()` and `xmlParseSGMLCatalog()` recursively call         each other without bounds until stack overflow.

    CVE-2026-0989

        The RelaxNG parser does not limit the recursion depth when resolving         `<include>` directives, which may lead to stack overflow on         malicious RelaxNG schema file.

    CVE-2026-0990

        Nick Wellnhofer discovered that `xmlCatalogXMLResolveURI()` will         recurse infinitely if a catalog has a URI delegate referencing         itself, eventually resulting in a call stack overflow.

    CVE-2026-0992

        Nick Wellnhofer discovered that processing a chain of XML catalogs         linked with `<nextCatalog>` and having the `<nextCatalog>` element         takes exponential time, leading to denial of service via resource         exhaustion.

    CVE-2026-1757

        The command parsing logic of the xmllint(1) interactive shell was         found to leak memory.

    In addition, a few other security issues were found for which no CVE ID     was assigned yet:

       * Memory leak of prefix in `xmlTextWriterStartElementNS()`.

       * Potential use-after-free issue in `xmlRelaxNGValidateValue()`.

       * Memory leak in `xmlTextWriterStartAttributeNS()`.

       * Additional memory leaks on error paths in schematron.

       * Stack overflow from self-referencing SGML CATALOG entries.

    For Debian 11 bullseye, these problems have been fixed in version     2.9.10+dfsg-6.7+deb11u10.

    We recommend that you upgrade your libxml2 packages.

    For the detailed security status of libxml2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libxml2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

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 libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in     the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references     itself. A remote attacker could exploit this configuration-dependent issue by providing a specially     crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a     segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.(CVE-2026-0990)

    A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when     processing XML catalogs that contain repeated nextCatalog elements pointing to the same downstream     catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to     redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application     availability, resulting in a denial-of-service condition.(CVE-2026-0992)

    A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are     handled. The parser does not enforce a limit on inclusion depth when resolving nested include     directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This     may lead to stack exhaustion and application crashes, creating a denial-of-service risk.(CVE-2026-0989)

    A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local     system.(CVE-2026-1757)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libxml2 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 libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local     system.(CVE-2026-1757)

    A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when     processing XML catalogs that contain repeated nextCatalog elements pointing to the same downstream     catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to     redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application     availability, resulting in a denial-of-service condition.(CVE-2026-0992)

    A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in     the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references     itself. A remote attacker could exploit this configuration-dependent issue by providing a specially     crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a     segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.(CVE-2026-0990)

    A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are     handled. The parser does not enforce a limit on inclusion depth when resolving nested include     directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This     may lead to stack exhaustion and application crashes, creating a denial-of-service risk.(CVE-2026-0989)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libxml2 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 libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are     handled. The parser does not enforce a limit on inclusion depth when resolving nested include     directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This     may lead to stack exhaustion and application crashes, creating a denial-of-service risk.(CVE-2026-0989)

    A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in     the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references     itself. A remote attacker could exploit this configuration-dependent issue by providing a specially     crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a     segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.(CVE-2026-0990)

    A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when     processing XML catalogs that contain repeated nextCatalog elements pointing to the same downstream     catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to     redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application     availability, resulting in a denial-of-service condition.(CVE-2026-0992)

    A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local     system.(CVE-2026-1757)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization libxml2 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 version of libxml2 installed on the remote host is prior to 2.11.9 / 2.15.2. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-070-02 advisory.

    New libxml2 packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libxml2 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 SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:20631-1 advisory.

    Changes in libxml2:

    - CVE-2026-0990: call stack overflow may lead to application crash due to infinite recursion in       `xmlCatalogXMLResolveURI` (bsc#1256807, bsc#1256811).
    - CVE-2026-0992: excessive resource consumption when processing XML catalogs due to exponential behavior     when handling       `nextCatalog` elements (bsc#1256809, bsc#1256812).
    - CVE-2025-8732: infinite recursion in catalog parsing functions when processing malformed SGML catalog     files       (bsc#1247858).
    - CVE-2026-1757: memory leak in the `xmllint` interactive shell (bsc#1257594, bsc#1257595).
    - CVE-2025-10911: parsing xsl nodes may lead to use-after-free with key data stored cross-RVT     (bsc#1250553)

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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1446 advisory.

    A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local system.
    (CVE-2026-1757)

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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20312-1 advisory.

    Changes in libxml2:

    - CVE-2026-0990: call stack overflow may lead to application crash due to infinite recursion in       `xmlCatalogXMLResolveURI` (bsc#1256807, bsc#1256811).
    - CVE-2026-0992: excessive resource consumption when processing XML catalogs due to exponential behavior     when handling       `nextCatalog` elements (bsc#1256809, bsc#1256812).
    - CVE-2025-8732: infinite recursion in catalog parsing functions when processing malformed SGML catalog     files       (bsc#1247858).
    - CVE-2026-1757: memory leak in the `xmllint` interactive shell (bsc#1257594, bsc#1257595).
    - CVE-2025-10911: parsing xsl nodes may lead to use-after-free with key data stored cross-RVT     (bsc#1250553)

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 version of libxml2 installed on the remote host is prior to 2.9.1-6. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3178 advisory.

    A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local system.
    (CVE-2026-1757)

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 SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0782-1 advisory.

    - CVE-2026-0990: Fixed a call stack overflow leading to application crash due to infinite recursion in     `xmlCatalogXMLResolveURI`. (bsc#1256807, bsc#1256811)
    - CVE-2026-0992: Fixed an excessive resource consumption when processing XML catalogs due to exponential     behavior. (bsc#1256809, bsc#1256812)
    - CVE-2026-1757: Fixed a memory leak in the `xmllint` interactive shell. (bsc#1257594, bsc#1257595)
    - CVE-2025-10911: Fixed a use-after-free with key data stored cross-RVT. (bsc#1250553)

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-2026:0605-1 advisory.

    - CVE-2026-0990: Fixed a call stack overflow leading to application crash due to infinite recursion in     `xmlCatalogXMLResolveURI`. (bsc#1256807, bsc#1256811)
    - CVE-2026-0992: Fixed an excessive resource consumption when processing XML catalogs due to exponential     behavior. (bsc#1256809, bsc#1256812)
    - CVE-2026-1757: Fixed a memory leak in the `xmllint` interactive shell. (bsc#1257594, bsc#1257595)
    - CVE-2025-10911: Fixed a use-after-free with key data stored cross-RVT. (bsc#1250553)
    - CVE-2025-8732: Fixed an infinite recursion in catalog parsing functions when processing malformed SGML     catalog files. (bsc#1247858)
    - CVE-2026-0989: Fixe a call stack exhaustion leading to application crash due to RelaxNG parser not     limiting the recursion depth. (bsc#1256805, bsc#1256810)

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 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0570-1 advisory.

    - CVE-2026-0990: Fixed a call stack overflow leading to application crash due to infinite recursion in     `xmlCatalogXMLResolveURI`. (bsc#1256807, bsc#1256811)
    - CVE-2026-0992: Fixed an excessive resource consumption when processing XML catalogs due to exponential     behavior. (bsc#1256809, bsc#1256812)
    - CVE-2026-1757: Fixed a memory leak in the `xmllint` interactive shell. (bsc#1257594, bsc#1257595)
    - CVE-2025-10911: Fixed a use-after-free with key data stored cross-RVT. (bsc#1250553)
    - CVE-2025-8732: Fixed an infinite recursion in catalog parsing functions when processing malformed SGML     catalog files. (bsc#1247858)

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 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0568-1 advisory.

    - CVE-2026-0990: Fixed a call stack overflow leading to application crash due to infinite recursion in     `xmlCatalogXMLResolveURI`. (bsc#1256807, bsc#1256811)
    - CVE-2026-0992: Fixed an excessive resource consumption when processing XML catalogs due to exponential     behavior. (bsc#1256809, bsc#1256812)
    - CVE-2026-1757: Fixed a memory leak in the `xmllint` interactive shell. (bsc#1257594, bsc#1257595)
    - CVE-2025-10911: Fixed a use-after-free with key data stored cross-RVT. (bsc#1250553)

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

  - A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where     memory allocated for user input is not properly released under certain conditions. When a user submits     input consisting only of whitespace, the program skips command execution but fails to free the allocated     buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system     memory and terminate the xmllint process, creating a denial-of-service condition on the local system.
    (CVE-2026-1757)

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

ID	Name	Product	Family	Severity
322260	Ubuntu 25.10 / 26.04 LTS : libxml2 vulnerabilities (USN-8460-1)	Nessus	Ubuntu Local Security Checks	high
322163	Photon OS 5.0: Libxml2 PHSA-2026-5.0-0874	Nessus	PhotonOS Local Security Checks	medium
319670	Debian dla-4622 : libxml2 - security update	Nessus	Debian Local Security Checks	medium
319479	EulerOS Virtualization 2.12.0 : libxml2 (EulerOS-SA-2026-2106)	Nessus	Huawei Local Security Checks	medium
319456	EulerOS Virtualization 2.13.1 : libxml2 (EulerOS-SA-2026-2139)	Nessus	Huawei Local Security Checks	medium
319455	EulerOS Virtualization 2.12.1 : libxml2 (EulerOS-SA-2026-2081)	Nessus	Huawei Local Security Checks	medium
319406	EulerOS Virtualization 2.10.1 : libxml2 (EulerOS-SA-2026-2028)	Nessus	Huawei Local Security Checks	medium
319376	EulerOS Virtualization 2.10.0 : libxml2 (EulerOS-SA-2026-2055)	Nessus	Huawei Local Security Checks	medium
319332	EulerOS Virtualization 2.13.0 : libxml2 (EulerOS-SA-2026-2178)	Nessus	Huawei Local Security Checks	medium
301909	Slackware Linux 15.0 / current libxml2 Multiple Vulnerabilities (SSA:2026-070-02)	Nessus	Slackware Local Security Checks	medium
301455	SUSE SLES16 Security Update : libxml2, libxslt (SUSE-SU-2026:20631-1)	Nessus	SuSE Local Security Checks	medium
301348	Amazon Linux 2023 : libxml2, libxml2-devel, libxml2-static (ALAS2023-2026-1446)	Nessus	Amazon Linux Local Security Checks	medium
301309	openSUSE 16 Security Update : libxml2, libxslt (openSUSE-SU-2026:20312-1)	Nessus	SuSE Local Security Checks	medium
301261	Amazon Linux 2 : libxml2, --advisory ALAS2-2026-3178 (ALAS-2026-3178)	Nessus	Amazon Linux Local Security Checks	medium
300833	SUSE SLES12: libxml2-2 / libxml2-2-32bit / libxml2-devel / libxml2-doc / etc (SUSE-SU-2026:0782-1)	Nessus	SuSE Local Security Checks	medium
300043	SUSE SLED15 / SLES15 Security Update : libxml2 (SUSE-SU-2026:0605-1)	Nessus	SuSE Local Security Checks	medium
299578	openSUSE 15: libxml2-2 / libxml2-2-32bit / libxml2-devel / libxml2-devel-32bit / etc (SUSE-SU-2026:0570-1)	Nessus	SuSE Local Security Checks	medium
299355	openSUSE 15 Security Update : libxml2 (SUSE-SU-2026:0568-1)	Nessus	SuSE Local Security Checks	medium
297549	Linux Distros Unpatched Vulnerability : CVE-2026-1757	Nessus	Misc.	medium

Detections

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CVE-2026-1757

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