CVE-2026-13122 | OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through … | CVSS 5.9 MEDIUM

Description

OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to cause a denial of service via a malformed authentication token that triggers a reachable assertion when external-auth is enabled

Metadata

CVE ID: CVE-2026-13122
State: PUBLISHED
Assigner: OpenVPN
Reserved: 2026-06-23 22:11 UTC
Published: 2026-07-06 14:32 UTC
Last updated: 2026-07-06 15:51 UTC
Primary CWE: CWE-617
CWE-617 Reachable Assertion
Vendor / Product: Openvpn / OpenVPN
Sources: cve.org · NVD

Severity & Metrics

5.9 MEDIUM CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Openvpn	OpenVPN	—	2.6.0 ≤ 2.6.20, 2.7_alpha1 ≤ 2.7.4

Weakness (CWE)

CWE	Source	Description
CWE-617	cna	CWE-617 Reachable Assertion

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.9	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References (1)

https://community.openvpn.net/Security%20Announcements/CVE-2026-13122