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High, CVSS 8.6

OpenH264 Rust API Openh264 Decoding Functions Heap Overflow Vulnerability

GHSA-5pmw-9j92-3c4c

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (openh264-sys2 0.8.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.6 · 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 · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

OpenH264 recently reported a heap overflow that was fixed in upstream 63db555 and integrated into 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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5pmw-9j92-3c4c

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-5pmw-9j92-3c4c

Advisory: OpenH264 Rust API Openh264 Decoding Functions Heap Overflow Vulnerability
IDs: GHSA-5pmw-9j92-3c4c
Record: https://patchnext.com/advisories/ghsa-5pmw-9j92-3c4c (revision 1, source checked 26 Oct 2026, 15:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: openh264-sys2 0.8.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io openh264-sys2: affected < 0.8.0; fixed in 0.8.0

## Suggested inspection (read-only)
- crates.io openh264-sys2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on openh264-sys2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5pmw-9j92-3c4c (GitHub-reviewed advisory GHSA-5pmw-9j92-3c4c lists affected ranges: crates.io openh264-sys2 >=0 <0.8.0)

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