Advisory Details

March 6th, 2026

GStreamer ASF Demuxer Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-26-164
ZDI-CAN-28843

CVE ID CVE-2026-2920
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS GStreamer
AFFECTED PRODUCTS GStreamer
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the processing of stream headers within ASF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS GStreamer has issued an update to correct this vulnerability. More details can be found at:
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/37d7991168a223d0810fd1f4493ec6a8b6a510d3
DISCLOSURE TIMELINE
  • 2026-02-11 - Vulnerability reported to vendor
  • 2026-03-06 - Coordinated public release of advisory
  • 2026-03-06 - Advisory Updated
CREDIT Anonymous
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