---
id: CVE-2026-54240
title: libde265 is an open source implementation of the h.265 video codec
summary: >-
  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 overflo…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-190
  - CWE-787
vendor: strukturag
product: libde265
affected:
  - libde265 < 1.1.1
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T19:17:30.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54240'
references:
  - url: >-
      https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00393
epssPercentile: 0.30643
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T18:37:02.738620Z'
ingestedAt: '2026-09-14T11:11:19.877Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.