CVE-2026-12996

Publication date 3 July 2026

Last updated 7 August 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvpn	26.04 LTS resolute	Fixed 2.7.0-1ubuntu1.2
	25.10 questing	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.6.19-0ubuntu0.24.04.3
	22.04 LTS jammy	Fixed 2.5.11-0ubuntu0.22.04.4
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

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

Package	Patch details
openvpn	Upstream: 5ee1f9b

Severity score breakdown

CVSS version:

Base score 6.0 · Medium

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Attack requirements	Present
Privileges required	Low
User interaction	None
Vulnerable system - Confidentiality impact	Low
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	6.0 · Medium
Base + Threat score	-
Base + Environmental score	-
Base + Threat + Environmental score	-

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

Base score 8.1 · High