CVE-2026-33165

EUVD-2026-13812

20.03.2026, 21:17

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	5.5 MEDIUM	LOCAL	LOW	NONE	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Affected Products (NVD)

Vendor	Product	Version
struktur	libde265	𝑥 < 1.0.17

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

libde265

bookworm	vulnerable
bullseye	vulnerable
bullseye (security)	1.0.11-0+deb11u4 fixed
forky	1.0.18-1 fixed
sid	1.0.18-1 fixed
trixie	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

libde265

bionic	needed
focal	needed
jammy	needed
noble	needed
questing	needed
resolute	needed
xenial	needed

Known Exploits!

https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg

Common Weakness Enumeration

CWE-787 - Out-of-bounds Write
The software writes data past the end, or before the beginning, of the intended buffer.

References

https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658

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

https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg