CVE-2026-33165 | strukturag libde265 up to 1.0.16 Image Parser ctb_info.log2unitSize PicWidthInCtbsY/PicHeightInCtbsY out-of-bounds write (GHSA-653q-9f73-8hvg)

VDB-352125 · CVE-2026-33165 · GHSA-653Q-9F73-8HVG STRUKTURAG LIBDE265 UP TO 1.0.16 IMAGE PARSER CTB_INFO.LOG2UNITSIZE PICWIDTHINCTBSY/PICHEIGHTINCTBSY OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.8 $0-$5k 1.64+ 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. 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. 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/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.9 VulDB Meta Temp Score: 5.8 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.5 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: libde265 1.0.17 Patch: c7891e412106130b83f8e8ea8b7f907e9449b658 Timelineinfo 03/17/2026 CVE reserved 03/20/2026 +3 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-653q-9f73-8hvg Status: Confirmed CVE: CVE-2026-33165 (🔒) GCVE (CVE): GCVE-0-2026-33165 GCVE (VulDB): GCVE-100-352125 Entryinfo Created: 03/20/2026 23:27 Changes: 03/20/2026 23:27 (70) Complete: 🔍 Cache ID: 99:A2C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸