An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2829-1 advisory.

    - CVE-2026-56208: untrusted encoder configuration inputs can lead to a heap-based buffer overflow and a     process crash (bsc#1268650).
    - CVE-2026-56209: crafted video frames with specific Y-plane pixel values can lead to an arbitrary memory     write (bsc#1268651).
    - CVE-2026-56210: missing bounds check on layer_id inputs can lead to an out-of-bounds heap read     (bsc#1268653).
    - CVE-2026-56211: out-of-range spatial/temporal layer selection can lead to remote code execution     (bsc#1268655).

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-2026:21061-1 advisory.

    This update for libaom fixes the following issues

    - CVE-2026-56208: untrusted encoder configuration inputs can lead to a heap-based buffer overflow and a     process crash       (bsc#1268650).
    - CVE-2026-56209: crafted video frames with specific Y-plane pixel values can lead to an arbitrary memory     write       (bsc#1268651).
    - CVE-2026-56210: missing bounds check on layer_id inputs can lead to an out-of-bounds heap read     (bsc#1268653).
    - CVE-2026-56211: out-of-range spatial/temporal layer selection can lead to remote code execution     (bsc#1268655).

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.

  - An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A     missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to     inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder     then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and     does not require a separate information leak. An attacker who can supply frames to a network-facing libaom     encoder with SVC enabled could exploit this for denial of service or potential code execution.
    (CVE-2026-56209)

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

ID	Name	Product	Family	Severity
326330	SUSE SLES15 Security Update : libaom (SUSE-SU-2026:2829-1)	Nessus	SuSE Local Security Checks	high
324060	openSUSE 16 Security Update : libaom (openSUSE-SU-2026:21061-1)	Nessus	SuSE Local Security Checks	high
321797	Linux Distros Unpatched Vulnerability : CVE-2026-56209	Nessus	Misc.	high

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CVE-2026-56209

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