A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could exploit this by providing a malicious document, leading to a type confusion error that causes the application to crash. This results in a denial of service (DoS), making the affected system or application unavailable.

photon_os PHSA-2026-5.0-0874: Unknown PhotonOS Security Updated

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22636-1 advisory.

    This update for libxml2 fixes the following issues

    - CVE-2026-6732: crafted XSD-validated document can cause a denial of service (bsc#1262719).
    - CVE-2026-11979: stack-based buffer overflows in the `xmlcatalog` utility when running in `--shell` mode     (bsc#1269790).

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-2026:21317-1 advisory.

    This update for libxml2 fixes the following issues

    - CVE-2026-6732: crafted XSD-validated document can cause a denial of service (bsc#1262719).
    - CVE-2026-11979: stack-based buffer overflows in the `xmlcatalog` utility when running in `--shell` mode     (bsc#1269790).

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 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 version of AIX installed on the remote host is prior to APAR IJ58140. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ58140 advisory.

  - A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML     Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could     exploit this by providing a malicious document, leading to a type confusion error that causes the     application to crash. This results in a denial of service (DoS), making the affected system or application     unavailable. (CVE-2026-6732)

  - 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)

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 AIX installed on the remote host is prior to APAR IJ58124. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ58124 advisory.

  - A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML     Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could     exploit this by providing a malicious document, leading to a type confusion error that causes the     application to crash. This results in a denial of service (DoS), making the affected system or application     unavailable. (CVE-2026-6732)

  - 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)

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 AIX installed on the remote host is prior to APAR IJ58306. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ58306 advisory.

  - A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML     Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could     exploit this by providing a malicious document, leading to a type confusion error that causes the     application to crash. This results in a denial of service (DoS), making the affected system or application     unavailable. (CVE-2026-6732)

  - 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)

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 AIX installed on the remote host is prior to APAR IJ58122. It is, therefore, affected by multiple vulnerabilities as referenced in the IJ58122 advisory.

  - A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML     Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could     exploit this by providing a malicious document, leading to a type confusion error that causes the     application to crash. This results in a denial of service (DoS), making the affected system or application     unavailable. (CVE-2026-6732)

  - 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)

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:

  - A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML
    Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could
    exploit this by providing a malicious document, leading to a type confusion error that causes the
    application to crash. This results in a denial of service (DoS), making the affected system or application
    unavailable. (CVE-2026-6732)

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 found in libxml2. This vulnerability occurs when the library processes a specially crafted XML     Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could     exploit this by providing a malicious document, leading to a type confusion error that causes the     application to crash. This results in a denial of service (DoS), making the affected system or application     unavailable. (CVE-2026-6732)

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

ID	Name	Product	Family	Severity
327570	SUSE SLES16: libxml2-2 / libxml2-devel / libxml2-doc / libxml2-tools / etc (SUSE-SU-2026:22636-1)	Nessus	SuSE Local Security Checks	low
327233	openSUSE 16 Security Update : libxml2 (openSUSE-SU-2026:21317-1)	Nessus	SuSE Local Security Checks	low
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
318324	AIX : Multiple Vulnerabilities (IJ58140)	Nessus	AIX Local Security Checks	high
318323	AIX : Multiple Vulnerabilities (IJ58124)	Nessus	AIX Local Security Checks	high
318322	AIX : Multiple Vulnerabilities (IJ58306)	Nessus	AIX Local Security Checks	high
318321	AIX : Multiple Vulnerabilities (IJ58122)	Nessus	AIX Local Security Checks	high
442557	Alpine: libxml2: security update to 2.13.9-r1	Tenable Cloud Security	Alpine Linux Local Security Checks	high
442557	Alpine: libxml2: security update to 2.13.9-r1	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
310046	Linux Distros Unpatched Vulnerability : CVE-2026-6732	Nessus	Misc.	high

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