CVE-2026-5056CWE-121

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability

High · published July 29, 2026

CVSS v3.0
7.8
EPSS
0%
Percentile
26.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
7.8 · HIGH
Vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00341 · 26.4th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-07-29T19:10Z
EPSS history
Timeline
  • 29 JUL 19:10Z
    GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability
    cvelistv5