CVE-2026-33164

Publication date 20 March 2026

Last updated 20 July 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libde265	26.04 LTS resolute	Fixed 1.0.16-1ubuntu0.1~esm1
	25.10 questing	Ignored end of life, was needed
	24.04 LTS noble	Fixed 1.0.15-1ubuntu0.1
	22.04 LTS jammy	Fixed 1.0.8-1ubuntu0.3+esm2
	20.04 LTS focal	Fixed 1.0.4-1ubuntu0.4+esm2
	18.04 LTS bionic	Fixed 1.0.2-2ubuntu0.18.04.1~esm6
	16.04 LTS xenial	Ignored end of ESM support, was needed

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libde265	Upstream: c7891e4

Severity score breakdown

CVSS version:

Base score 8.7 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Attack requirements	None
Privileges required	None
User interaction	None
Vulnerable system - Confidentiality impact	None
Vulnerable system - Integrity impact	None
Vulnerable system - Availability impact	High
Subsequent system - Confidentiality impact	None
Subsequent system - Integrity impact	None
Subsequent system - Availability impact	None

Scores

Parameter	Value
Base score	8.7 · High
Base + Threat score	-
Base + Environmental score	-
Base + Threat + Environmental score	-

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Base score 7.5 · High