Stack-based buffer overflow in gstreamer - CVE-2026-5056

Vulnerability identifier: #VU126830

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-5056

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the parsing of UncompressedFrameConfigBox structures in the qtdemux element. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

gstreamer
Debian Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Ubuntu
Fedora
gst-plugins-good1.0 (Debian package)
gst-plugins-good1.0 (Ubuntu package)
gstreamer1-plugins-good (Red Hat package)
mingw-gstreamer1-plugins-good

Install updates from vendor's website.

gstreamer - update to 1.28.2
gst-plugins-good1.0 (Debian package) - update to 1.26.2-1+deb13u1
gst-plugins-good1.0 (Ubuntu package) - update to 1.26.5-1ubuntu2.2
gstreamer1-plugins-good (Red Hat package) - update to 1.26.7-2.el10_2.2
mingw-gstreamer1-plugins-good - update to 1.26.11-2.fc43

• https://www.zerodayinitiative.com/advisories/ZDI-26-283/
• https://gitlab.freedesktop.org/api/v4/projects/gstreamer%2Fgstreamer/repository/files/security-advisories%2Fsa-2026-0016.md/raw?ref=main
• https://gstreamer.freedesktop.org/security/sa-2026-0016.html

• Stack-based buffer overflow in GStreamer
• Ubuntu update for gst-plugins-good1.0
• Debian update for gst-plugins-good1.0
• Red Hat Enterprise Linux 10 update for gstreamer1-plugins-good
• Fedora 43 update for mingw-gstreamer1-plugins-good