What is CVE-2026-33164?

CVE-2026-33164 is a high-severity vulnerability in Struktur Libde265, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-03-20.

How severe is CVE-2026-33164?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Struktur Libde265

CVE-2026-33164

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a malformed H.265 PPS NAL unit causes a segmentation fault in pic_parameter_set::set_derived_values(). This issue has been patched in version 1.0.17.

Vulnerability class: Buffer Overflow

Published 2026-03-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (29.0th percentile), scored 2026-10-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.002

Affected products

Struktur Libde265
Strukturag Libde265 — versions < 1.0.17

Weakness classification (CWE)

References

github.com/strukturag/libde265/security/advisories/GHSA-wqrf-6rf5-v78r (Exploit, Vendor Advisory)
github.com/strukturag/libde265/releases/tag/v1.0.17 (Release Notes)

Frequently asked questions

What is CVE-2026-33164?: CVE-2026-33164 is a high-severity vulnerability in Struktur Libde265, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-03-20.
How severe is CVE-2026-33164?: High severity. CVSS v3 base score is 7.5 out of 10.