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Permalink CVE-2026-13122

5.9 MEDIUM

CVSS version (CVSS): 4.0
Attack Vector (AV): Network (N)
Attack Complexity (AC): High (H)
Attack Requirement (AT): Present (P)
Privileges Required (PR): Low (L)
User Interaction (UI): Passive (P)
Vulnerable System Impact Confidentiality (VC): None (N)
Vulnerable System Impact Integrity (VI): None (N)
Vulnerable System Impact Availability (VA): High (H)
Subsequent System Impact Confidentiality (SC): None (N)
Subsequent System Impact Integrity (SI): None (N)
Subsequent System Impact Availability (SA): None (N)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): High (H)
Modified Attack Requirement (MAT): Present (P)
Modified Privileges Required (MPR): Low (L)
Modified User Interaction (MUI): Passive (P)
Modified Vulnerable System Impact Confidentiality (MVC): None (N)
Modified Vulnerable System Impact Integrity (MVI): None (N)
Modified Vulnerable System Impact Availability (MVA): High (H)
Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
Modified Subsequent System Impact Integrity (MSI): Negligible (N)
Modified Subsequent System Impact Availability (MSA): Negligible (N)
Safety (S): Not Defined (X)
Automatable (AU): Not Defined (X)
Recovery (R): Not Defined (X)
Value Density (V): Not Defined (X)
Vulnerability Response Effort (RE): Not Defined (X)
Provider Urgency (U): Not Defined (X)
Confidentiality Req. (CR): Not Defined (X)
Integrity Req. (IR): Not Defined (X)
Availability Req. (AR): Not Defined (X)
Exploit Maturity (E): Not Defined (X)

created 1 week, 3 days ago Activity log

Created suggestion 1 week, 3 days ago

OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows …

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

References

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

Affected products

OpenVPN

=<2.7.4
=<2.6.20

Matching in nixpkgs

pkgs.openvpn

Robust and highly flexible tunneling application

nixos-unstable 2.6.19
- nixpkgs-unstable 2.6.19
- nixos-unstable-small 2.6.19
nixos-26.05 2.6.19
- nixos-26.05-small 2.6.19
- nixpkgs-26.05-darwin 2.6.19

pkgs.openvpn3

OpenVPN 3 Linux client

nixos-unstable 27
- nixpkgs-unstable 27
- nixos-unstable-small 27
nixos-26.05 27
- nixos-26.05-small 27
- nixpkgs-26.05-darwin 27

pkgs.openvpn-auth-ldap

LDAP authentication plugin for OpenVPN

nixos-unstable 2.0.4
- nixpkgs-unstable 2.0.4
- nixos-unstable-small 2.0.4
nixos-26.05 2.0.4
- nixos-26.05-small 2.0.4
- nixpkgs-26.05-darwin 2.0.4

pkgs.namespaced-openvpn

Network namespace isolation for OpenVPN tunnels

nixos-unstable 0.6.0
- nixpkgs-unstable 0.6.0
- nixos-unstable-small 0.6.0
nixos-26.05 0.6.0
- nixos-26.05-small 0.6.0
- nixpkgs-26.05-darwin 0.6.0

pkgs.openvpn_learnaddress

Openvpn learn-address script to manage a hosts-like file

nixos-unstable 2013-10-21
- nixpkgs-unstable 2013-10-21
- nixos-unstable-small 2013-10-21
nixos-26.05 2013-10-21
- nixos-26.05-small 2013-10-21
- nixpkgs-26.05-darwin 2013-10-21

pkgs.networkmanager-openvpn

NetworkManager's OpenVPN plugin

nixos-unstable 1.12.3
- nixpkgs-unstable 1.12.3
- nixos-unstable-small 1.12.3
nixos-26.05 1.12.3
- nixos-26.05-small 1.12.3
- nixpkgs-26.05-darwin 1.12.3

pkgs.nagiosPlugins.check_openvpn

Nagios/icinga/sensu check plugin for OpenVPN

nixos-unstable 0.0.1
- nixpkgs-unstable 0.0.1
- nixos-unstable-small 0.0.1
nixos-26.05 0.0.1
- nixos-26.05-small 0.0.1
- nixpkgs-26.05-darwin 0.0.1

Package maintainers

@peterhoeg Peter Hoeg <peter@hoeg.com>
@lodi Anthony Lodi <anthony.lodi@gmail.com>
@obadz obadz <obadz-nixos@obadz.com>
@jtojnar Jan Tojnar <jtojnar@gmail.com>
@benley Benjamin Staffin <benley@gmail.com>
@JarvisCraft Petr Portnov <mrjarviscraft+nix@gmail.com>