VulnerabilityAnalyzed

CVE-2026-33165

Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer.

MEDIUM 5.0EPSS 0.23%

Does this matter?

Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.0 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.23% probability · 14th percentile
CISA KEV: Not listed
Weakness: CWE-787
Affected: struktur/libde265
Source: security-advisories@github.com

References

https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658Patch
https://github.com/strukturag/libde265/releases/tag/v1.0.17Release Notes
https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvgExploit, Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.