UnratedFix available

UBUNTU-CVE-2026-84732

Type: advisorySource: OSV1 source record

Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to cause a denial of service via crafted inputs that trigger a timeout integer overflow

Announced 7 Sept 2026Group revision 1

Original source ↗

UBUNTU-CVE-2026-84732

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:UBUNTU-CVE-2026-84732

openvpn

Source reference: /affected/0/package/name

Affected versions: 2.3.2-4ubuntu1
Source reference: /affected/0/versions
2.3.2-5ubuntu1
Source reference: /affected/0/versions
2.3.2-7ubuntu1
Source reference: /affected/0/versions
2.3.2-7ubuntu2
Source reference: /affected/0/versions
2.3.2-7ubuntu3
Source reference: /affected/0/versions
2.3.2-7ubuntu3.1
Source reference: /affected/0/versions
2.3.2-7ubuntu3.2
Source reference: /affected/0/versions
2.3.2-7ubuntu3.2+esm1
Source reference: /affected/0/versions
2.3.2-7ubuntu3.2+esm2
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/1/package/name

Affected versions: 2.3.7-1ubuntu1
Source reference: /affected/1/versions
2.3.7-2ubuntu1
Source reference: /affected/1/versions
2.3.8-1ubuntu1
Source reference: /affected/1/versions
2.3.10-1ubuntu1
Source reference: /affected/1/versions
2.3.10-1ubuntu2
Source reference: /affected/1/versions
2.3.10-1ubuntu2.1
Source reference: /affected/1/versions
2.3.10-1ubuntu2.2
Source reference: /affected/1/versions
2.3.10-1ubuntu2.2+esm1
Source reference: /affected/1/versions
2.3.10-1ubuntu2.2+esm2
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/2/package/name

Affected versions: 2.4.3-4ubuntu1
Source reference: /affected/2/versions
2.4.4-1ubuntu1
Source reference: /affected/2/versions
2.4.4-2ubuntu1
Source reference: /affected/2/versions
2.4.4-2ubuntu1.1
Source reference: /affected/2/versions
2.4.4-2ubuntu1.2
Source reference: /affected/2/versions
2.4.4-2ubuntu1.3
Source reference: /affected/2/versions
2.4.4-2ubuntu1.5
Source reference: /affected/2/versions
2.4.4-2ubuntu1.6
Source reference: /affected/2/versions
2.4.4-2ubuntu1.7
Source reference: /affected/2/versions
2.4.4-2ubuntu1.7+esm1
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/3/package/name

Affected versions: 2.4.7-1ubuntu2
Source reference: /affected/3/versions
2.4.7-1ubuntu2.20.04.2
Source reference: /affected/3/versions
2.4.7-1ubuntu2.20.04.3
Source reference: /affected/3/versions
2.4.7-1ubuntu2.20.04.4
Source reference: /affected/3/versions
2.4.12-0ubuntu0.20.04.1
Source reference: /affected/3/versions
2.4.12-0ubuntu0.20.04.2
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/4/package/name

Affected versions: 2.5.1-3ubuntu1
Source reference: /affected/4/versions
2.5.1-3ubuntu2
Source reference: /affected/4/versions
2.5.1-3ubuntu4
Source reference: /affected/4/versions
2.5.1-3ubuntu5
Source reference: /affected/4/versions
2.5.5-1ubuntu1
Source reference: /affected/4/versions
2.5.5-1ubuntu3
Source reference: /affected/4/versions
2.5.5-1ubuntu3.1
Source reference: /affected/4/versions
2.5.9-0ubuntu0.22.04.2
Source reference: /affected/4/versions
2.5.9-0ubuntu0.22.04.3
Source reference: /affected/4/versions
2.5.11-0ubuntu0.22.04.1
Source reference: /affected/4/versions
2.5.11-0ubuntu0.22.04.3
Source reference: /affected/4/versions
2.5.11-0ubuntu0.22.04.4
Source reference: /affected/4/versions
Fixed versions: 2.5.11-0ubuntu0.22.04.5
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/5/package/name

Affected versions: 2.6.5-0ubuntu1
Source reference: /affected/5/versions
2.6.7-1ubuntu1
Source reference: /affected/5/versions
2.6.9-1ubuntu2
Source reference: /affected/5/versions
2.6.9-1ubuntu3
Source reference: /affected/5/versions
2.6.9-1ubuntu4
Source reference: /affected/5/versions
2.6.9-1ubuntu4.1
Source reference: /affected/5/versions
2.6.12-0ubuntu0.24.04.1
Source reference: /affected/5/versions
2.6.12-0ubuntu0.24.04.3
Source reference: /affected/5/versions
2.6.14-0ubuntu0.24.04.1
Source reference: /affected/5/versions
2.6.14-0ubuntu0.24.04.2
Source reference: /affected/5/versions
2.6.14-0ubuntu0.24.04.3
Source reference: /affected/5/versions
2.6.19-0ubuntu0.24.04.1
Source reference: /affected/5/versions
2.6.19-0ubuntu0.24.04.2
Source reference: /affected/5/versions
2.6.19-0ubuntu0.24.04.3
Source reference: /affected/5/versions
Fixed versions: 2.6.19-0ubuntu0.24.04.4
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

openvpn

Source reference: /affected/6/package/name

Affected versions: 2.6.14-2ubuntu1
Source reference: /affected/6/versions
2.6.15-1ubuntu1
Source reference: /affected/6/versions
2.7.0~rc5-1ubuntu5
Source reference: /affected/6/versions
2.7.0~rc6-1ubuntu1
Source reference: /affected/6/versions
2.7.0-1ubuntu1
Source reference: /affected/6/versions
2.7.0-1ubuntu1.1
Source reference: /affected/6/versions
2.7.0-1ubuntu1.2
Source reference: /affected/6/versions
Fixed versions: 2.7.0-1ubuntu1.3
Source reference: /affected/6/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
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        "type": "ECOSYSTEM",
        "events": [
          {
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    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra-legacy%2Ftrusty",
      "ecosystem": "Ubuntu:Pro:14.04:LTS"
    },
    "versions": [
      "2.3.2-4ubuntu1",
      "2.3.2-5ubuntu1",
      "2.3.2-7ubuntu1",
      "2.3.2-7ubuntu2",
      "2.3.2-7ubuntu3",
      "2.3.2-7ubuntu3.1",
      "2.3.2-7ubuntu3.2",
      "2.3.2-7ubuntu3.2+esm1",
      "2.3.2-7ubuntu3.2+esm2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
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    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra%2Fxenial",
      "ecosystem": "Ubuntu:Pro:16.04:LTS"
    },
    "versions": [
      "2.3.7-1ubuntu1",
      "2.3.7-2ubuntu1",
      "2.3.8-1ubuntu1",
      "2.3.10-1ubuntu1",
      "2.3.10-1ubuntu2",
      "2.3.10-1ubuntu2.1",
      "2.3.10-1ubuntu2.2",
      "2.3.10-1ubuntu2.2+esm1",
      "2.3.10-1ubuntu2.2+esm2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
      "binaries": [
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          "binary_name": "openvpn",
          "binary_version": "2.3.10-1ubuntu2.2+esm2"
        }
      ]
    }
  },
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    ],
    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra%2Fbionic",
      "ecosystem": "Ubuntu:Pro:18.04:LTS"
    },
    "versions": [
      "2.4.3-4ubuntu1",
      "2.4.4-1ubuntu1",
      "2.4.4-2ubuntu1",
      "2.4.4-2ubuntu1.1",
      "2.4.4-2ubuntu1.2",
      "2.4.4-2ubuntu1.3",
      "2.4.4-2ubuntu1.5",
      "2.4.4-2ubuntu1.6",
      "2.4.4-2ubuntu1.7",
      "2.4.4-2ubuntu1.7+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "openvpn",
          "binary_version": "2.4.4-2ubuntu1.7+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=focal",
      "ecosystem": "Ubuntu:20.04:LTS"
    },
    "versions": [
      "2.4.7-1ubuntu2",
      "2.4.7-1ubuntu2.20.04.2",
      "2.4.7-1ubuntu2.20.04.3",
      "2.4.7-1ubuntu2.20.04.4",
      "2.4.12-0ubuntu0.20.04.1",
      "2.4.12-0ubuntu0.20.04.2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "openvpn",
          "binary_version": "2.4.12-0ubuntu0.20.04.2"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.5.11-0ubuntu0.22.04.5"
          }
        ]
      }
    ],
    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "2.5.1-3ubuntu1",
      "2.5.1-3ubuntu2",
      "2.5.1-3ubuntu4",
      "2.5.1-3ubuntu5",
      "2.5.5-1ubuntu1",
      "2.5.5-1ubuntu3",
      "2.5.5-1ubuntu3.1",
      "2.5.9-0ubuntu0.22.04.2",
      "2.5.9-0ubuntu0.22.04.3",
      "2.5.11-0ubuntu0.22.04.1",
      "2.5.11-0ubuntu0.22.04.3",
      "2.5.11-0ubuntu0.22.04.4"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "openvpn",
          "binary_version": "2.5.11-0ubuntu0.22.04.5"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
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          }
        ]
      }
    ],
    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "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",
      "2.6.19-0ubuntu0.24.04.3"
    ],
    "database_specific": {
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    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "openvpn",
          "binary_version": "2.6.19-0ubuntu0.24.04.4"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.7.0-1ubuntu1.3"
          }
        ]
      }
    ],
    "package": {
      "name": "openvpn",
      "purl": "pkg:deb/ubuntu/openvpn?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "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",
      "2.7.0-1ubuntu1.2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84732.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "openvpn",
          "binary_version": "2.7.0-1ubuntu1.3"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #51964 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 14:36:46 GMT
Publisher date: Mon, 07 Sep 2026 09:17:00 GMT

Read the original announcement

Revision history

25 Oct 2026UBUNTU-CVE-2026-84732 · Revision 1Source updated