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libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.0.19 have a heap buffer overflow (out-of-bounds READ) exists in `decoder_context::decode_slice_unit_WPP()` in `libde265/decctx.cc`. When decoding a WPP (Wavefront Parallel Processing) HEVC slice, `ctbAddrRS` is computed as `ctbRow * ctbsWidth` inside the entry-point loop. If the PPS/SPS headers are crafted so that this value exceeds `pps.CtbAddrRStoTS.size()`, the subsequent array access `pps.CtbAddrRStoTS[ctbAddrRS]` reads past the end of the allocated vector, triggering a heap-buffer-overflow confirmed by AddressSanitizer. Version 1.0.19 patches the issue.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade libde265 | Oct 28, 2026 | Jul 21, 2026 |
| Debian | — | Upgrade libde265 | Aug 9, 2026 | Aug 9, 2026 |
| Ubuntu | — | Upgrade libde265-devUpgrade libde265-0Upgrade libde265-dev (Ubuntu Pro)Upgrade libde265-0 (Ubuntu Pro)No solution exists | Jul 21, 2026 | Jul 20, 2026 |
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