GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

July 3rd, 2025
ZDI-25-467 ZDI-CAN-27381

CVE ID

CVE-2025-6663

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 H266 sei messages. 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/tpm/gstreamer/-/commit/eedd01ac3dfeb60e36a44bb61a6d0418454e8416

Disclosure Timeline

  • 2025-06-23 - Vulnerability reported to vendor
  • 2025-07-03 - Coordinated public release of advisory
  • 2025-07-03 - Advisory Updated

Credit

MICHAEL RANDRIANANTENAINA [https://elkamika.blogspot.com/]

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