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DEBIAN-CVE-2026-41070

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-41070

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-41070

openvpn-auth-oauth2

Source reference: /affected/0/package/name

Affected versions
1.26.2+dfsg-1

Source reference: /affected/0/versions

1.26.4+dfsg-1

Source reference: /affected/0/versions

1.26.4+dfsg-2

Source reference: /affected/0/versions

1.26.4+dfsg-3

Source reference: /affected/0/versions

1.26.4+dfsg-4

Source reference: /affected/0/versions

1.26.4+dfsg-5

Source reference: /affected/0/versions

1.26.4+dfsg-6

Source reference: /affected/0/versions

1.27.0-1

Source reference: /affected/0/versions

1.27.0-2

Source reference: /affected/0/versions

1.27.1-1

Source reference: /affected/0/versions

1.27.2-1

Source reference: /affected/0/versions

Fixed versions
1.27.3-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.27.3-1"
          }
        ]
      }
    ],
    "package": {
      "name": "openvpn-auth-oauth2",
      "purl": "pkg:deb/debian/openvpn-auth-oauth2?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.26.2+dfsg-1",
      "1.26.4+dfsg-1",
      "1.26.4+dfsg-2",
      "1.26.4+dfsg-3",
      "1.26.4+dfsg-4",
      "1.26.4+dfsg-5",
      "1.26.4+dfsg-6",
      "1.27.0-1",
      "1.27.0-2",
      "1.27.1-1",
      "1.27.2-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41070.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57661 · Revision 1
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Publisher date
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