Description
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.
Problem types
Product status
Timeline
| 2026-04-16: | Reported to Red Hat. |
| 2026-06-10: | Made public. |
Credits
Red Hat would like to thank Tianshuo Han for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-53701
bugzilla.redhat.com/show_bug.cgi?id=2487611 (RHBZ#2487611)