CVE-2026-13122: Openvpn

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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

Affected products

• Openvpn Openvpn: from 2.6.0, before 2.6.21 (fixed in 2.6.21); from 2.7, before 2.7.5 (fixed in 2.7.5)

Published 2026-07-06. Last modified 2026-07-09.