What is CVE-2026-13122?

CVE-2026-13122 is a medium-severity vulnerability in Openvpn, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-07-06.

How severe is CVE-2026-13122?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Openvpn

CVE-2026-13122

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

EPSS: 0.003 (22.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Openvpn — versions 2.6.0, 2.7_alpha1

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

security@openvpn.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-13122?: CVE-2026-13122 is a medium-severity vulnerability in Openvpn, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-07-06.
How severe is CVE-2026-13122?: Medium severity. CVSS v3 base score is 5.3 out of 10.