CVE-2026-5673 — MEDIUM (5.6)

Vulnerability Description

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.

CVSS Score

5.6

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Xiph	Theora	-
Redhat	Enterprise Linux	6.0

Related Weaknesses (CWE)

CWE-125

References

https://access.redhat.com/security/cve/CVE-2026-5673Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455340Issue TrackingThird Party Advisory
https://github.com/xiph/theora/issues/24ExploitIssue TrackingThird Party Advisory

FAQ

What is CVE-2026-5673?

CVE-2026-5673 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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 atta...

How severe is CVE-2026-5673?

CVE-2026-5673 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-5673?

Check the references section above for vendor advisories and patch information. Affected products include: Xiph Theora, Redhat Enterprise Linux.