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.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:20178-1 advisory.

    - CVE-2026-0989: Fixed call stack exhaustion leading to application crash       due to RelaxNG parser not limiting the recursion depth when       resolving `<include>` directives (bsc#1256805).

Tenable has extracted the preceding description block directly from the SUSE 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 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:0391-1 advisory.

    - CVE-2026-0989: Fixed call stack exhaustion leading to application       crash due to RelaxNG parser not limiting the recursion depth when       resolving `<include>` directives (bsc#1256805)

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

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1397 advisory.

    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 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 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 ALAS2-2026-3145 advisory.

    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 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 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:0334-1 advisory.

    - CVE-2026-0989: Fixed call stack exhaustion leading to application       crash due to RelaxNG parser not limiting the recursion depth when       resolving `<include>` directives (bsc#1256805)

Tenable has extracted the preceding description block directly from the SUSE 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 a vulnerability as referenced in the SUSE- SU-2026:0336-1 advisory.

    - CVE-2026-0989: Fixed call stack exhaustion leading to application crash       due to RelaxNG parser not limiting the recursion depth when       resolving `<include>` directives (bsc#1256805).

Tenable has extracted the preceding description block directly from the SUSE 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 Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7974-1 advisory.

    It was discovered that libxml2 incorrectly handled maliciously crafted SGML catalog files. An attacker     could possibly use this issue to cause libxml2 to consume excessive resources, leading to a denial of     service. (CVE-2025-8732)

    It was discovered that libxml2 incorrectly handled recursive include directories with the RelaxNG parser.
    An attacker could possibly use this issue to cause libxml2 to consume excessive resources, leading to a     denial of service. (CVE-2026-0989)

    Nick Wellnhofer discovered that libxml2 incorrectly parsed catalogs with self-referencing URI delegates.
    An attacker could possibly use this issue to cause libxml2 to consume excessive resources, leading to a     denial of service. (CVE-2026-0990)

    Nick Wellnhofer discovered that libxml2 inefficiently parsed catalogs linked with repeating nextCatalog     elements. An attacker could possibly use this issue to cause libxml2 to use excessive resources, leading     to a denial of service. (CVE-2026-0992)

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.

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 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)

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

ID	Name	Product	Family	Severity
298294	openSUSE 16 Security Update : libxml2 (openSUSE-SU-2026:20178-1)	Nessus	SuSE Local Security Checks	low
298232	openSUSE 15 Security Update : libxml2 (SUSE-SU-2026:0391-1)	Nessus	SuSE Local Security Checks	low
298086	Amazon Linux 2023 : libxml2, libxml2-devel, libxml2-static (ALAS2023-2026-1397)	Nessus	Amazon Linux Local Security Checks	low
298075	Amazon Linux 2 : libxml2, --advisory ALAS2-2026-3145 (ALAS-2026-3145)	Nessus	Amazon Linux Local Security Checks	low
297427	openSUSE 15 Security Update : libxml2 (SUSE-SU-2026:0334-1)	Nessus	SuSE Local Security Checks	low
297426	SUSE SLES12 Security Update : libxml2 (SUSE-SU-2026:0336-1)	Nessus	SuSE Local Security Checks	low
296249	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 : libxml2 vulnerabilities (USN-7974-1)	Nessus	Ubuntu Local Security Checks	medium
286280	Linux Distros Unpatched Vulnerability : CVE-2026-0989	Nessus	Misc.	low

Detections

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CVE-2026-0989

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Tenable Plugins

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