ubuntu-cve-2026-13122
Vulnerability from osv_ubuntu
Published
2026-07-06 16:16
Modified
2026-07-14 18:45
Summary
Details

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

Severity
5.9 (Medium)
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.6.19-0ubuntu0.24.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.6.19-0ubuntu0.24.04.3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.19-0ubuntu0.24.04.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.5-0ubuntu1",
        "2.6.7-1ubuntu1",
        "2.6.9-1ubuntu2",
        "2.6.9-1ubuntu3",
        "2.6.9-1ubuntu4",
        "2.6.9-1ubuntu4.1",
        "2.6.12-0ubuntu0.24.04.1",
        "2.6.12-0ubuntu0.24.04.3",
        "2.6.14-0ubuntu0.24.04.1",
        "2.6.14-0ubuntu0.24.04.2",
        "2.6.14-0ubuntu0.24.04.3",
        "2.6.19-0ubuntu0.24.04.1",
        "2.6.19-0ubuntu0.24.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.6.19-0ubuntu0.25.10.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.6.19-0ubuntu0.25.10.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.13-1ubuntu3",
        "2.6.14-1ubuntu1",
        "2.6.14-2ubuntu1",
        "2.6.14-2ubuntu1.1",
        "2.6.19-0ubuntu0.25.10.1",
        "2.6.19-0ubuntu0.25.10.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.7.0-1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.7.0-1ubuntu1.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.0-1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.14-2ubuntu1",
        "2.6.15-1ubuntu1",
        "2.7.0~rc5-1ubuntu5",
        "2.7.0~rc6-1ubuntu1",
        "2.7.0-1ubuntu1",
        "2.7.0-1ubuntu1.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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",
  "id": "UBUNTU-CVE-2026-13122",
  "modified": "2026-07-14T18:45:47Z",
  "published": "2026-07-06T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-13122"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-13122"
    },
    {
      "type": "REPORT",
      "url": "https://community.openvpn.net/Security%20Announcements/CVE-2026-13122"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8540-1"
    }
  ],
  "related": [
    "USN-8540-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-13122"
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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