CVE-2026-54240 — HIGH (7.4)

Vulnerability 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.

CVSS Score

7.4

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-190 CWE-787

References

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

FAQ

What is CVE-2026-54240?

CVE-2026-54240 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 dim...

How severe is CVE-2026-54240?

CVE-2026-54240 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-54240?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.