Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-54241: SAO sequential filter heap buffer overflow via signed integer overflow CVE-2026-54240: Pixel accessor signed integer overflow causes heap OOB read/write CVE-2026-45383: 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. CVE-2026-45382: decoder_context::decode_slice_unit_tiles (libde265/decctx.cc:920) reads pps.CtbAddrRStoTS[ctbAddrRS] at line 966 where ctbAddrRS = ctbY * ctbsWidth + ctbX is computed from PPS-supplied colBd[]/rowBd[] arrays without validating the result against CtbAddrRStoTS.size() == sps->PicSizeInCtbsY. A malformed PPS that passes set_derived_values but encodes geometry inconsistent with the SPS produces a ctbAddrRS past the allocation, causing a 4-byte heap-buffer-overflow READ.
Fixed packages 4
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | libde265 | 0:1.0.18-1.amzn2023.0.3 |
| Amazon Linux · 2023 | libde265-debuginfo | 0:1.0.18-1.amzn2023.0.3 |
| Amazon Linux · 2023 | libde265-debugsource | 0:1.0.18-1.amzn2023.0.3 |
| Amazon Linux · 2023 | libde265-devel | 0:1.0.18-1.amzn2023.0.3 |
Vulnerabilities 4
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High 7.4
libde265: Pixel accessor signed integer overflow causes heap OOB read/write
libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate pixel offsets, allowing a crafted HEVC stream with large image dimensions to trigger an integer overflow and cause out-of-bou…
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High 7.4
libde265: SAO sequential filter heap buffer overflow via signed integer overflow
libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate the sample adaptive offset input-buffer size, allowing a crafted HEVC stream with large dimensions and 16-bit luma samples to…
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Medium 6.9
libde265 has a heap-buffer-overflow READ in decode_slice_unit_tiles via unvalidated PPS tile geometry
libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.19, `decoder_context::decode_slice_unit_tiles` (libde265/decctx.cc:920) reads `pps.CtbAddrRStoTS[ctbAddrRS]` at line 966 where `ctbAddrRS = ctbY * ctbsWidth + ctbX` is co…
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Medium 6.9
libde265 has a heap buffer overflow (OOB read) in decode_slice_unit_WPP() via out-of-bounds CtbAddrRStoTS access — libde265 <= v1.0.18
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…