| Name | CVE-2026-5673 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1133000 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libtheora (PTS) | bullseye | 1.1.1+dfsg.1-15 | vulnerable |
| bookworm | 1.1.1+dfsg.1-16.1+deb12u1 | vulnerable |
| trixie | 1.2.0~alpha1+dfsg-6 | vulnerable |
| forky, sid | 1.2.0+dfsg-6 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libtheora | source | (unstable) | (unfixed) | | | 1133000 |
Notes
[trixie] - libtheora <postponed> (Minor issue, revisit when fixed upstream)
[bookworm] - libtheora <postponed> (Minor issue, revisit when fixed upstream)
[bullseye] - libtheora <postponed> (Minor issue, revisit when fixed upstream)
https://github.com/xiph/theora/issues/24