CVE-2025-6663: gstreamer Stack Overflow — Fix

Description

GStreamer H266 Codec Parsing 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 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. Was ZDI-CAN-27381.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-121 CWE-121

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
gstreamer	gstreamer	1.26.0 — 1.26.3

References

Advisories & Patches

https://gitlab.freedesktop.org/tpm/gstreamer/-/commit/eedd01ac3dfeb60e36a44bb61a6d0418454e8416

Other References

https://www.zerodayinitiative.com/advisories/ZDI-25-467/

Frequently Asked Questions

What is CVE-2025-6663? +

GStreamer H266 Codec Parsing 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 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. Was ZDI-CAN-27381. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-6663? +

CVE-2025-6663 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-6663? +

CVE-2025-6663 affects products from gstreamer, specifically: gstreamer. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-6663? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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