# CVE-2026-17072: GStreamer gst-plugins-good heap out-of-bounds read in Matroska demuxer

Source: https://junglewise.ai/threats/cve-2026-17072-gstreamer-gst-plugins-good-heap-out-of-bounds-read-in-matroska  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-28. Updated: 2026-07-28  
License: CC BY 4.0 with a link back

CVE-2026-17072 · Severity: low · CVSS 3.3 · Published 2026-07-28

GStreamer is a widely used multimedia framework for handling audio and video playback on Linux and other systems. A flaw in how it processes FLAC audio files could allow a malicious file to read a small amount of memory it shouldn't have access to. While the risk of significant data theft is low, an attacker could potentially gain insight into the system's memory by tricking a user into opening a specially crafted media file.

Technologies: [Red Hat Enterprise Linux 10](https://junglewise.ai/threats/technologies/enterprise-linux-10), [Red Hat Enterprise Linux 6](https://junglewise.ai/threats/technologies/enterprise-linux-6), [Red Hat Enterprise Linux 7](https://junglewise.ai/threats/technologies/enterprise-linux-7), [Red Hat Enterprise Linux 8](https://junglewise.ai/threats/technologies/enterprise-linux-8), [Red Hat Enterprise Linux 9](https://junglewise.ai/threats/technologies/enterprise-linux-9). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-17072 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-17072 being exploited in the wild.

**How severe is CVE-2026-17072?** Low severity, with a CVSS score of 3.3, published 28 July 2026.

**Which products and versions are affected?** GStreamer gst-plugins-good <= 1.28.5; Red Hat Red Hat Enterprise Linux 6; Red Hat Red Hat Enterprise Linux 7; Red Hat Red Hat Enterprise Linux 8; and 2 more.

**Is there a fix for CVE-2026-17072?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-17072 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-17072?** Check whether you run Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability (CWE-125) exists in the Matroska demuxer within gst-plugins-good, specifically in the gst_matroska_parse_flac_stream_headers() function in gst/matroska/matroska-ids.c. The root cause is an insufficient boundary check that validates the offset and length of FLAC metadata blocks but fails to account for the 4-byte header when performing a memory duplication (gst_buffer_new_memdup). When the block length matches the remaining buffer size, the function reads 4 bytes past the allocated buffer. This can be triggered by a local user opening a specially crafted Matroska (.mkv) or WebM file. The issue is fixed in GStreamer version 1.28.6.

## Affected products

- GStreamer gst-plugins-good <= 1.28.5
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 10

## Timeline

- 2026-07-24: disclosed: Reported by Yazan Balawneh of CyStack Security Team
- 2026-07-28: advisory: NVD and Red Hat published advisory details

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-17072](https://access.redhat.com/security/cve/CVE-2026-17072)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2506750](https://bugzilla.redhat.com/show_bug.cgi?id=2506750)
- [https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/111](https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/111)

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