CVE-2026-54240

libde265: Pixel accessor signed integer overflow causes heap OOB read/write

State: Published
Severity: 7.4 High
Published: Sep 11, 2026
Updated: Sep 14, 2026
Reserved: Jun 12, 2026

Description

libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate pixel offsets, allowing a crafted HEVC stream with large image dimensions to trigger an integer overflow and cause out-of-bounds heap reads or writes, potentially disclosing data, corrupting memory, or crashing the decoder. Version 1.1.1 contains a patch.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H	GitHub_M

Weaknesses

CWE-190 Integer Overflow or Wraparound
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
libde265strukturag	< 1.1.1Affected

References

https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3

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