CVE catalog
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 atta
- Severity
- Medium · CVSS 5.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libtheora | sid | 1.2.0+dfsg-6 | vulnerable |
| Debian | libtheora | forky | 1.2.0+dfsg-6 | vulnerable |
| Debian | libtheora | trixie | 1.2.0~alpha1+dfsg-6 | vulnerable |
| Debian | libtheora | bookworm | 1.1.1+dfsg.1-16.1+deb12u1 | vulnerable |
| Cpe | libtheora | Not reported | Not reported | vulnerable |
| Cpe | theora | Not reported | Not reported | unknown |
| Cpe | enterprise_linux | Not reported | Not reported | unknown |
| Cpe | theora | Not reported | Not reported | unknown |
| Cpe | enterprise_linux | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libtheora | source | sid | (unfixed) | unimportant | Not reported | [1133000] |
| Debian | libtheora | source | forky | (unfixed) | unimportant | Not reported | [1133000] |
| Debian | libtheora | source | trixie | (unfixed) | unimportant | Not reported | [1133000] |
| Debian | libtheora | source | bookworm | (unfixed) | unimportant | Not reported | [1133000] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libtheora0]Affected
Source package: [libtheora]
Details (2)
1.1.1+dfsg.1-16.1+deb12u1· amd64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
1.1.1+dfsg.1-16.1+deb12u1· arm64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
- [libtheora-bin]Affected
Source package: [libtheora]
Details (2)
1.1.1+dfsg.1-16.1+deb12u1· amd64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
1.1.1+dfsg.1-16.1+deb12u1· arm64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
- [libtheora-dev]Affected
Source package: [libtheora]
Details (2)
1.1.1+dfsg.1-16.1+deb12u1· amd64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
1.1.1+dfsg.1-16.1+deb12u1· arm64 · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
- [libtheora-doc]Affected
Source package: [libtheora]
Details (2)
1.1.1+dfsg.1-16.1+deb12u1· all · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
1.1.1+dfsg.1-16.1+deb12u1· all · bookwormAffected
nvd · libtheora · debian · bookworm; nvd · libtheora · debian · 12
[Debian 13 (Trixie)]
- [libtheora0]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· amd64 · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· arm64 · trixieAffected
nvd · libtheora · debian · 13
- [libtheora-bin]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· amd64 · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· arm64 · trixieAffected
nvd · libtheora · debian · 13
- [libtheoradec1]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· amd64 · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· arm64 · trixieAffected
nvd · libtheora · debian · 13
- [libtheora-dev]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· amd64 · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· arm64 · trixieAffected
nvd · libtheora · debian · 13
- [libtheora-doc]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· all · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· all · trixieAffected
nvd · libtheora · debian · 13
- [libtheoraenc1]Affected
Source package: [libtheora]
Details (2)
1.2.0~alpha1+dfsg-6· amd64 · trixieAffected
nvd · libtheora · debian · 13
1.2.0~alpha1+dfsg-6· arm64 · trixieAffected
nvd · libtheora · debian · 13
Observed:
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]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-5673]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5673]
- [https://security-tracker.debian.org/tracker/CVE-2026-5673]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5673.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]