Security Advisory 2026-0022 (CVE-2026-39043)

Details

Heap buffer overflow in the Matroska (MKV) demuxer when calculating decompressed buffer sizes for bz2-compressed tracks. The issue occurs due to missing parentheses in the buffer size calculation, causing incorrect memory allocation and potential out-of-bounds writes.

Impact

A malicious third party could trigger a heap buffer overflow by providing a crafted Matroska file with bz2-compressed data. This could result in application crash or arbitrary code execution.

Solution

The gst-plugins-good 1.28.2 release addresses the issue. People using older versions of GStreamer should apply the patch and recompile.

References

The GStreamer project

• https://gstreamer.freedesktop.org

CVE Database Entries

• CVE-2026-39043

GStreamer 1.28.2 release

• Release Notes
• GStreamer Plugins Good 1.28.2

Patches

• Patch