GStreamer gsth266parser.c gst_h266_parser_parse_picture_partition out-of-bounds write

Summaryinfo

A vulnerability was found in GStreamer. It has been declared as critical. This affects the function gst_h266_parser_parse_picture_partition of the file gsth266parser.c. Such manipulation leads to out-of-bounds write. This vulnerability is referenced as CVE-2026-53701. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in GStreamer (version now known). Affected by this issue is the function gst_h266_parser_parse_picture_partition of the file gsth266parser.c. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An out-of-bounds write vulnerability was found in GStreamer's H.266/VVC PPS picture partition parser in gst-plugins-bad. In the multi-slice-in-tile processing of gst_h266_parser_parse_picture_partition() (gsth266parser.c), the loop iterates without checking that the slice index stays within bounds, writing past three fixed-size arrays (slice_height_in_ctus, slice_top_left_ctu_x, slice_top_left_ctu_y) in the GstH266PPS structure. While the initial proof-of-concept demonstrated a 4-byte out-of-bounds write, the code permits larger writes across multiple iterations. A crafted H.266/VVC media file can trigger this vulnerability.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-53701 since 06/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-36294) and CERT Bund (WID-SEC-2026-1478). Once again VulDB remains the best source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Ubuntu Linux
• Open Source GStreamer

Productinfo

Type

• Multimedia Processing Software

Name

• GStreamer

License

• open-source

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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