A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.

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-2026:0279-1 advisory.

    - CVE-2025-13193: Fixed umask for 'qemu-img' when creating external inactive snapshots (bsc#1253703)
    - CVE-2025-12748: Fixed check ACLs before parsing the whole domain XML (bsc#1253278)

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 SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0193-1 advisory.

    - CVE-2025-13193: Fixed umask for 'qemu-img' when creating external inactive snapshots (bsc#1253703)
    - CVE-2025-12748: Fixed check ACLs before parsing the whole domain XML (bsc#1253278)

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-2026:0068-1 advisory.

    - CVE-2025-13193: Fixed umask for 'qemu-img' when creating external inactive snapshots (bsc#1253703)
    - CVE-2025-12748: Fixed Check ACLs before parsing the whole domain XML (bsc#1253278)

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 libvirt installed on the remote host is prior to 4.5.0-36. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-3115 advisory.

    A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user     provided XML files was performed before the ACL checks. A malicious user with limited permissions could     exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory     on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting     in a denial-of-service condition. (CVE-2025-12748)

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-993323 advisory.

    A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user     provided XML files was performed before the ACL checks. A malicious user with limited permissions could     exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory     on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting     in a denial-of-service condition.

Tenable has extracted the preceding description block directly from the Unity Linux 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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the be3167b5-d140-11f0-ad27-c01803b56cc4 advisory.

    The libvirt project reports:
    See                                             changelog for details.

Tenable has extracted the preceding description block directly from the FreeBSD 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-2025-20100-1 advisory.

    - CVE-2025-13193: Fixed Information disclosure via world-readable VM snapshots (bsc#1253703)
    - CVE-2025-12748: Fixed Denial of service in XML parsing (bsc#1253278)

    Other fixes:

    - spec: Adjust dbus dependency (bsc#1253642)
    - qemu: Add support for Intel TDX (jsc#PED-9265)

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 discovered in libvirt in the XML file processing. More specifically, the parsing of user     provided XML files was performed before the ACL checks. A malicious user with limited permissions could     exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory     on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting     in a denial-of-service condition. (CVE-2025-12748)

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

ID	Name	Product	Family	Severity
296445	SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2026:0279-1)	Nessus	SuSE Local Security Checks	medium
294935	SUSE SLES12 Security Update : libvirt (SUSE-SU-2026:0193-1)	Nessus	SuSE Local Security Checks	medium
282496	openSUSE 15 Security Update : libvirt (SUSE-SU-2026:0068-1)	Nessus	SuSE Local Security Checks	medium
281801	Amazon Linux 2 : libvirt, --advisory ALAS2-2025-3115 (ALAS-2025-3115)	Nessus	Amazon Linux Local Security Checks	medium
281272	Unity Linux 20.1070e Security Update: libvirt (UTSA-2025-993323)	Nessus	Unity Linux Local Security Checks	medium
277600	FreeBSD : libvirt -- Multiple vulnerabilities (be3167b5-d140-11f0-ad27-c01803b56cc4)	Nessus	FreeBSD Local Security Checks	medium
277008	openSUSE 16 Security Update : libvirt (openSUSE-SU-2025-20100-1)	Nessus	SuSE Local Security Checks	medium
274838	Linux Distros Unpatched Vulnerability : CVE-2025-12748	Nessus	Misc.	medium

Detections

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CVE-2025-12748

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Tenable Plugins

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medium