CVE-2026-5673

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 3.1

7.1CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-26)

CWE

CWE-125

Published

2026-04-06

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• redhat:enterprise_linux
• xiph:theora

References

• https://access.redhat.com/security/cve/CVE-2026-5673
• https://bugzilla.redhat.com/show_bug.cgi?id=2455340
• https://github.com/xiph/theora/issues/24

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