Bug 2487611 (CVE-2026-53701)

Summary: CVE-2026-53701 gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds write in H.266/VVC PPS picture partition parser
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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.
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Description OSIDB Bzimport 2026-06-10 16:11:55 UTC 
GStreamer H.266/VVC PPS picture partition parser out-of-bounds write. In gst_h266_parser_parse_picture_partition(), the multi-slice-in-tile loop writes past fixed-size arrays without bounds checking. Fixed in GStreamer 1.28.3 (commit f66e8292ed, MR !11581). Reported via PSIRTSUPT-7239 by Tianshuo Han.