A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI
    (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker
    could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated
    header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive
    information from the heap. (CVE-2026-5673)

According to the versions of the libtheora packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI     (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker     could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated     header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive     information from the heap.(CVE-2026-5673)

Tenable has extracted the preceding description block directly from the EulerOS libtheora 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 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 libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI     (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker     could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated     header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive     information from the heap. (CVE-2026-5673)

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

ID	Name	Product	Family	Type	Severity
463268	Echo: libtheora: security update to 1.2.0~alpha1+dfsg-6+e1	Tenable Cloud Security	Echo Local Security Checks	Local	high
463268	Echo: libtheora: security update to 1.2.0~alpha1+dfsg-6+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
326652	EulerOS 2.0 SP10 : libtheora (EulerOS-SA-2026-2701)	Nessus	Huawei Local Security Checks	Local	high
326600	EulerOS 2.0 SP10 : libtheora (EulerOS-SA-2026-2660)	Nessus	Huawei Local Security Checks	Local	high
305062	Linux Distros Unpatched Vulnerability : CVE-2026-5673	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-5673

high

Tenable Plugins

high

high

high

high

high