CVE catalog

CVE-2025-27091

openh264: CVE-2025-27091

Severity: High · CVSS 8.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:H
Published: Feb 20, 2025, 6:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.69% · Oct 25, 2026

OpenH264 is a free license codec library which supports H.264 encoding and decoding. A vulnerability in the decoding functions of OpenH264 codec library could allow a remote, unauthenticated attacker to trigger a heap overflow. This vulnerability is due to a race condition between a Sequence Parameter Set (SPS) memory allocation and a subsequent non Instantaneous Decoder Refresh (non-IDR) Network Abstraction Layer (NAL) unit memory usage. An attacker could exploit this vulnerability by crafting a malicious bitstream and tricking a victim user into processing an arbitrary video containing the malicious bistream. An exploit could allow the attacker to cause an unexpected crash in the victim's user decoding client and, possibly, perform arbitrary commands on the victim's host by abusing the heap overflow. This vulnerability affects OpenH264 2.5.0 and earlier releases. Both Scalable Video Coding (SVC) mode and Advanced Video Coding (AVC) mode are affected by this vulnerability. OpenH264 software releases 2.6.0 and later contained the fix for this vulnerability. Users are advised to upgrade. There are no known workarounds for this vulnerability. ### For more information If you have any questions or comments about this advisory: * [Open an issue in cisco/openh264](https://github.com/cisco/openh264/issues) * Email Cisco Open Source Security ([oss-security@cisco.com](mailto:oss-security@cisco.com)) and Cisco PSIRT ([psirt@cisco.com](mailto:psirt@cisco.com)) ### Credits: * **Research:** Octavian Guzu and Andrew Calvano of Meta * **Fix ideation:** Philipp Hancke and Shyam Sadhwani of Meta * **Fix implementation:** Benzheng Zhang (@BenzhengZhang) * **Release engineering:** Benzheng Zhang (@BenzhengZhang)

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	openh264	sid	`2.6.0+dfsg-2`	fixed
Debian	openh264	forky	`2.6.0+dfsg-2`	fixed
Debian	openh264	trixie	`2.6.0+dfsg-2`	fixed
Debian	openh264	bookworm	`2.3.1+dfsg-3+deb12u2`	fixed
Debian	openh264	bookworm-security	`2.3.1+dfsg-3+deb12u1`	fixed
Ubuntu	openh264	22.04	`2.1.1+dfsg-1`	vulnerable
Ubuntu	openh264	22.04	`2.1.1+dfsg-2`	vulnerable
Ubuntu	openh264	22.04	`2.2.0+dfsg-1`	vulnerable
Ubuntu	openh264	22.04	`2.2.0+dfsg-2`	vulnerable
Ubuntu	openh264	24.04	`2.3.1+dfsg-3`	vulnerable
Ubuntu	openh264	24.04	`2.3.1+dfsg-4`	vulnerable
Ubuntu	openh264	24.04	`2.4.0+dfsg-1`	vulnerable
Ubuntu	openh264	24.04	`2.4.1+dfsg-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openh264	source	sid	`2.5.0+dfsg-2`	not yet assigned	Not reported	[1098470]
Debian	openh264	source	forky	`2.5.0+dfsg-2`	not yet assigned	Not reported	[1098470]
Debian	openh264	source	trixie	`2.5.0+dfsg-2`	not yet assigned	Not reported	[1098470]
Debian	openh264	source	bookworm	`2.3.1+dfsg-3+deb12u1`	not yet assigned	Not reported	[1098470]

[Debian bug #1098470]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libopenh264-7]Fixed
Source package: [openh264]
Details (4)
- 2.3.1+dfsg-3+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
[libopenh264-cisco7]Fixed
Source package: [openh264]
Details (2)
- 2.3.1+dfsg-3+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
[libopenh264-dev]Fixed
Source package: [openh264]
Details (4)
- 2.3.1+dfsg-3+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12
- 2.3.1+dfsg-3+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 2.3.1+dfsg-3+deb12u1
  dsa · openh264 · debian · bookworm; dsa · openh264 · debian · 12

[Debian 13 (Trixie)]

[libopenh264-8]Fixed
Source package: [openh264]
Details (2)
- 2.6.0+dfsg-2 · amd64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13
- 2.6.0+dfsg-2 · arm64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13
[libopenh264-cisco8]Fixed
Source package: [openh264]
Details (2)
- 2.6.0+dfsg-2 · amd64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13
- 2.6.0+dfsg-2 · arm64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13
[libopenh264-dev]Fixed
Source package: [openh264]
Details (2)
- 2.6.0+dfsg-2 · amd64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13
- 2.6.0+dfsg-2 · arm64 · trixie
  Fixed · Fixed: 2.5.0+dfsg-2
  dsa · openh264 · debian · 13

Observed: Oct 26, 2026, 11:18:41 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]