strukturag libde265 up to 1.0.19 libde265/decctx.cc process_reference_picture_set out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in strukturag libde265 up to 1.0.19. Affected is the function decoder_context::process_reference_picture_set of the file libde265/decctx.cc. The manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-49295. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in strukturag libde265 up to 1.0.19. Affected is the function decoder_context::process_reference_picture_set of the file libde265/decctx.cc. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted H.265 bitstream can cause an out-of-bounds array write in `decoder_context::process_reference_picture_set()` (`libde265/decctx.cc:1376`). The root cause is a missing aggregate bound check on predicted short-term reference picture set entries. Individual list sizes are validated, but the combined count after predicted RPS construction can exceed the 16-entry `PocStFoll` array, writing at index 16. Version 1.0.20 patches the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-49295 since 05/28/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 1.0.20 eliminates this vulnerability. Applying the patch 691f3a3c55b3d32478c4a49895dee061a282652b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38079). Once again VulDB remains the best source for vulnerability data.

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
• 1.0.19

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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