Advisory Details

April 15th, 2026

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2026-5056
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 parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-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/api/v4/projects/gstreamer%2Fgstreamer/repository/files/security-advisories%2Fsa-2026-0016.md/raw?ref=main
DISCLOSURE TIMELINE	2026-03-12 - Vulnerability reported to vendor 2026-04-15 - Coordinated public release of advisory 2026-04-15 - Advisory Updated
CREDIT	DongHyeon Hwang (kind_killerwhale)

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