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 reachabl

mediumCVSS 5.3CVE-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

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.3
Published: 2026-07-06
Last updated: 2026-07-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-13122

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-131220.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-13122	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] OpenVPN: Multiple vulnerabilitiescert-bund
unknownDSA-6376-1 openvpn - security updatedebian

Recent advisories for OpenVPN

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] OpenVPN: Vulnerability allows data manipulationcert-bund · 2026-07-09
highCVE-2025-3110: OpenVPN Access Server 2.7.2 through 3.1.0 accepts bare line-feed sequences inside HTTP header v…nvd · 2026-07-08
high[NEW] [high] OpenVPN: Multiple vulnerabilitiescert-bund · 2026-07-07
highCVE-2026-13698: A memory leak in OpenVPN version 2.5.0 through 2.5.11, 2.6.0 through 2.6.20 and 2.7_alpha1 thr…nvd · 2026-07-06
unknownDSA-6376-1 openvpn - security updatedebian · 2026-07-03
highCVE-2026-58000: luci-proto-openvpn through 0.11.1, fixed in commit e4ff45e, contains a command injection vulne…nvd · 2026-06-29