CVE-2026-5673: Red Hat Enterprise Linux

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Xiph Theora: affected versions not specified

Published 2026-04-06. Last modified 2026-06-17.