🛡️ GHSA-5pmw-9j92-3c4c — openh264-sys2

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-122 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

OpenH264 Rust API Openh264 Decoding Functions Heap Overflow Vulnerability

OpenH264 recently reported a [heap overflow](https://github.com/cisco/openh264/security/advisories/GHSA-m99q-5j7x-7m9x) that was fixed in upstream [63db555](https://github.com/cisco/openh264/commit/63db555e30986e3a5f07871368dc90ae78c27449) and [integrated into](https://github.com/ralfbiedert/openh264-rs/commit/3a822fff0b4c9a984622ca2b179fe8898ac54b14) our 0.6.6 release. For users relying on Cisco's pre-compiled DLL, we also published 0.8.0, which is compatible with their latest fixed DLL version 2.6.0.

In other words:

  • if you rely on our source feature only, >=0.6.6 should be safe,
  • if you rely on libloading, you must upgrade to 0.8.0 _and_ use their latest DLL >=2.6.0.

Users handling untrusted video files should update immediately.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must actively cooperate. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

GHSA-5pmw-9j92-3c4c is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

GHSA-5pmw-9j92-3c4c is recorded against 1 package.

  • openh264-sys2

Timeline and source

Published on 24 February 2025 and last revised on 28 October 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE CWE-122
Public Exploit ✅ No
Source OSV
Published 2025-02-24
Updated 2026-08-12
Modified 2025-10-28
Fix URL N/A

Affected Packages

Software From version Fixed in
openh264-sys2 — —

Similar Threats

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