CVE-2026-33165 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-24 | Assigner GitHub_M

MEDIUM: 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

CWE-787: Out-of-bounds Write

Product status

< 1.0.17

affected

References

github.com/...bde265/security/advisories/GHSA-653q-9f73-8hvg

github.com/...ommit/c7891e412106130b83f8e8ea8b7f907e9449b658

github.com/strukturag/libde265/releases/tag/v1.0.17

cve.org (CVE-2026-33165)

nvd.nist.gov (CVE-2026-33165)

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