Skip to content
Fencer Vulns
high 7.8

CVE-2026-5056 json

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability

published 2026-07-29 3 mo ago modified 2026-07-30 3 mo ago also EUVD-2026-50497

cvss
7.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. 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. Was ZDI-CAN-29392.

Patch / fix

  • gst-plugins-good1.0 Debian 13 1.26.2-1+deb13u1
  • gst-plugins-good1.0 Debian 14 1.28.2-1

debian advisories DEBIAN-CVE-2026-5056

  • gst-plugins-good1.0 Ubuntu 25.10 1.26.5-1ubuntu2.2

ubuntu advisories UBUNTU-CVE-2026-5056

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gstreamer1-plugins-good RHEL 10.2 1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-gtk RHEL 10.2 1.26.7-2.el10_2.2

red hat advisories RHSA-2026:49508

  • gstreamer1-plugins-good AlmaLinux 10 1.26.7-2.el10_2.2
  • gstreamer1-plugins-good-gtk AlmaLinux 10 1.26.7-2.el10_2.2

almalinux advisories ALSA-2026:49508

  • gstreamer1-plugins-good Rocky Linux 10 1.26.7-2.el10_2.2

rocky linux advisories RLSA-2026:49508

  • gst-plugins-good Alpine 3.24 1.26.3-r0

alpine advisories ALPINE-CVE-2026-5056

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-5056 updated cvss 7.8

gstreamer-plugins-good: GStreamer: Arbitrary code execution via stack-based buffer overflow in qtdemux

  • Red Hat Enterprise Linux AppStream (v. 10) gstreamer1-plugins-good 1.26.7-2.el10_2.2, gstreamer1-plugins-good-gtk 1.26.7-2.el10_2.2
    fixed: vendor fix “Do not open, preview, or auto-index untrusted MOV/MP4 files with GStreamer-based apps; leave RHEL memory protections and SELinux enabled” RHSA-2026:49508
  • Red Hat Enterprise Linux 6 gstreamer-plugins-good Red Hat Enterprise Linux 7 gstreamer-plugins-good, gstreamer1-plugins-good Red Hat Enterprise Linux 8 gstreamer1-plugins-good, gstreamer1-plugins-good-gtk, mingw-gstreamer1-plugins-good, mingw32-gstreamer1-plugins-good, mingw64-gstreamer1-plugins-good Red Hat Enterprise Linux 9 gstreamer1-plugins-good, gstreamer1-plugins-good-gtk
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • GStreamer GStreamer

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.