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Advisory severityMedium5.3Red Hat Linux

Medium [CVE-2026-13122] From CVEorg collector

This medium-severity Red Hat Linux advisory covers CVE-2026-13122.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-13122 Source published Source updated

VulniPulse record published Record updated

CVE-2026-13122
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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 A flaw was found in OpenVPN. A remote attacker can exploit this vulnerability by sending a malformed authentication token.

This can trigger a reachable assertion when external authentication (external-auth) is enabled, leading to a Denial of Service (DoS) condition for the OpenVPN server. This issue specifically impacts deployments where external authentication is enabled, increasing the attack surface.

Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-617.

Is CVE-2026-13122 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-13122 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-13122?

The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions
  • 2.6.0
  • 2.6.20
  • 2.7.4

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To reduce exposure, disable the `external-auth` feature in OpenVPN if it is not required. This can be done by removing or commenting out the `external-auth` directive in the OpenVPN configuration file. If `external-auth` is necessary, restrict network access to the OpenVPN service to trusted clients through firewall rules. A restart of the OpenVPN service is required for configuration changes to take effect, which may temporarily disrupt active connections.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

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