UBUNTU-CVE-2026-41070

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Source
https://ubuntu.com/security/CVE-2026-41070
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41070.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-41070
Upstream
Published
2026-05-08T16:16:00Z
Modified
2026-07-02T18:02:59Z
Severity
  • 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

openvpn-auth-oauth2 is a plugin/management interface client for OpenVPN server to handle an OIDC based single sign-on (SSO) auth flows. From version 1.26.3 to before version 1.27.3, when openvpn-auth-oauth2 is deployed in the experimental plugin mode (shared library loaded by OpenVPN via the plugin directive), clients that do not support WebAuth/SSO (e.g., the openvpn CLI on Linux) are incorrectly admitted to the VPN despite being denied by the authentication logic. The default management-interface mode is not affected because it does not use the OpenVPN plugin return-code mechanism. This issue has been patched in version 1.27.3.

References

Affected packages

Ubuntu:Pro:26.04:LTS / openvpn-auth-oauth2

Package

Name
openvpn-auth-oauth2
Purl
pkg:deb/ubuntu/openvpn-auth-oauth2?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.27.0-2
1.27.0-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvpn-auth-oauth2",
            "binary_version": "1.27.0-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41070.json"