strukturag libde265 up to 1.0.18 WPP Slice Processing libde265/decctx.cc decode_slice_unit_WPP out-of-bounds

Summaryinfo

A vulnerability classified as critical was found in strukturag libde265 up to 1.0.18. The impacted element is the function decoder_context::decode_slice_unit_WPP of the file libde265/decctx.cc of the component WPP Slice Processing. Such manipulation leads to out-of-bounds. This vulnerability is referenced as CVE-2026-45383. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in strukturag libde265 up to 1.0.18. Affected by this issue is the function decoder_context::decode_slice_unit_WPP of the file libde265/decctx.cc of the component WPP Slice Processing. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-45383 since 05/12/2026. 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 to version 1.0.19 eliminates this vulnerability.

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Productinfo

Vendor

• strukturag

Name

• libde265

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18

License

• open-source

Website

• Product: https://github.com/strukturag/libde265/

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