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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-6663)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2025-6663)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 69bfe2a4-5a39-11f0-8792-4ccc6adda413 advisory.

    GStreamer Security Center reports:
    It is possible for a malicious third party to trigger a buffer overflow that can                result in a crash of the application and possibly also allow code execution through                stack manipulation.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
250839	Linux Distros Unpatched Vulnerability : CVE-2025-6663	Nessus	Misc.	high
428397	Alpine: multiple gst-plugins-bad packages: security update to 1.26.3-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
428397	Alpine: multiple gst-plugins-bad packages: security update to 1.26.3-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
241387	FreeBSD : gstreamer1-plugins-bad -- stack buffer overflow in H.266 video parser (69bfe2a4-5a39-11f0-8792-4ccc6adda413)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2025-6663

high

Tenable Plugins

high

high

high

critical