strukturag libde265 up to 1.0.16 Image Parser ctb_info.log2unitSize PicWidthInCtbsY/PicHeightInCtbsY out-of-bounds write

Summaryinfo

A vulnerability marked as critical has been reported in strukturag libde265 up to 1.0.16. This issue affects the function ctb_info.log2unitSize of the component Image Parser. Performing a manipulation of the argument PicWidthInCtbsY/PicHeightInCtbsY results in out-of-bounds write. This vulnerability is known as CVE-2026-33165. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in strukturag libde265 up to 1.0.16. This affects the function ctb_info.log2unitSize of the component Image Parser. The manipulation of the argument PicWidthInCtbsY/PicHeightInCtbsY 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. The summary by CVE is:

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer. The trigger is a stale ctb_info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY stay constant but Log2CtbSizeY changes, causing set_SliceHeaderIndex to index past the allocated image metadata array and write 2 bytes past the end of a heap allocation. This issue has been patched in version 1.0.17.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33165 since 03/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 303273 (Linux Distros Unpatched Vulnerability : CVE-2026-33165), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.0.17 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c7891e412106130b83f8e8ea8b7f907e9449b658 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 databases at Tenable (303273) and EUVD (EUVD-2026-13812). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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

License

• open-source

Website

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

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