CVE-2026-13122 PUBLISHED

Assigner: OpenVPN
Reserved: 23.06.2026 Published: 06.07.2026 Updated: 06.07.2026

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

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 5.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Openvpn
Product	OpenVPN
Versions	Default: unaffected affected from 2.6.0 to 2.6.20 (incl.) affected from 2.7_alpha1 to 2.7.4 (incl.)

References

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

Problem Types

CWE-617 Reachable Assertion CWE