Buffer overflow in Strukturag Libde265
CVE-2026-54240
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.
Vulnerability class: Integer Overflow
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Strukturag Libde265 — versions < 1.1.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-54240?
- CVE-2026-54240 is a high-severity vulnerability in Strukturag Libde265, classified under Integer Overflow or Wraparound. CVSS score: 7.4/10. Published 2026-09-11.
- How severe is CVE-2026-54240?
- High severity. CVSS v3 base score is 7.4 out of 10.