CVE-2026-88964

Publication date 13 October 2026

Last updated 28 October 2026

Ubuntu priority

Description

An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvpn	26.10 stonking	Not affected
	26.04 LTS resolute	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

This issue only affects Windows and Android, not Linux.

Patch details

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

Package	Patch details
openvpn	Upstream: d586f8a

Severity score breakdown

CVSS version: CVSS v4.0

Base score 7.1 · 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	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	7.1 · 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:N/VA:H/SC:N/SI:N/SA:N

References

Other references

https://www.cve.org/CVERecord?id=CVE-2026-88964