# CVE-2026-54240

## Summary

- **CVE ID:** CVE-2026-54240
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** CWE-190, CWE-787
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 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.

## Affected Products

- strukturag — libde265 (< 1.1.1)

## References

- [CNA](https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._