CVE-2026-84471

Publication date 4 September 2026

Last updated 28 October 2026

Ubuntu priority

Description

The fix for CVE-2026-12996 was incomplete. A use-after-free in OpenVPN 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.7 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	26.10 stonking	Not affected
	26.04 LTS resolute	Fixed in 2.7.0-1ubuntu1.3
	24.04 LTS noble	Fixed in 2.6.19-0ubuntu0.24.04.4
	22.04 LTS jammy	Fixed in 2.5.11-0ubuntu0.22.04.5
	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: c52f940

Severity score breakdown

CVSS version: CVSS v4.0

Base score 7.2 · High

Base metrics

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

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

References

Related Ubuntu Security Notices (USN)

USN-8852-1
OpenVPN vulnerabilities
30 September 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2026-84471