openssh, openssh-ssh1 — security advisory

{
  "id": "72341322355850c549a7b162de00530871f84f6e0c9fe218fa1858ea8564765e",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-26465",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2025-26465",
    "summary": "A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.",
    "evidence": "osv:UBUNTU-CVE-2025-26465",
    "products": [
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        "name": {
          "value": "openssh",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1:7.2p2-4ubuntu2.10+esm7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
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            "value": "1:6.9p1-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:6.9p1-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:7.1p1-1",
            "evidence": "/affected/0/versions"
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          {
            "value": "1:7.1p1-3",
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          {
            "value": "1:7.1p1-4",
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          {
            "value": "1:7.1p1-6",
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          {
            "value": "1:7.1p2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:7.1p2-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:7.2p1-1",
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          },
          {
            "value": "1:7.2p2-1",
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          {
            "value": "1:7.2p2-2",
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          {
            "value": "1:7.2p2-3",
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          {
            "value": "1:7.2p2-4",
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          {
            "value": "1:7.2p2-4ubuntu1",
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          {
            "value": "1:7.2p2-4ubuntu2.1",
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          },
          {
            "value": "1:7.2p2-4ubuntu2.2",
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          },
          {
            "value": "1:7.2p2-4ubuntu2.4",
            "evidence": "/affected/0/versions"
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          {
            "value": "1:7.2p2-4ubuntu2.5",
            "evidence": "/affected/0/versions"
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          {
            "value": "1:7.2p2-4ubuntu2.6",
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            "value": "1:7.2p2-4ubuntu2.7",
            "evidence": "/affected/0/versions"
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          {
            "value": "1:7.2p2-4ubuntu2.8",
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          {
            "value": "1:7.2p2-4ubuntu2.10",
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          {
            "value": "1:7.2p2-4ubuntu2.10+esm1",
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          {
            "value": "1:7.2p2-4ubuntu2.10+esm2",
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          {
            "value": "1:7.2p2-4ubuntu2.10+esm4",
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          {
            "value": "1:7.2p2-4ubuntu2.10+esm5",
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          {
            "value": "1:7.2p2-4ubuntu2.10+esm6",
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        ]
      },
      {
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            "evidence": "/affected/1/versions"
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          {
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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            "evidence": "/affected/3/versions"
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      },
      {
        "name": {
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            "evidence": "/affected/4/versions"
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            "value": "1:7.5p1-9",
            "evidence": "/affected/4/versions"
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            "value": "1:7.5p1-9build1",
            "evidence": "/affected/4/versions"
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        "affected_versions": [
          {
            "value": "1:7.5p1-17",
            "evidence": "/affected/20/versions"
          },
          {
            "value": "1:7.5p1-18",
            "evidence": "/affected/20/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2025-26465",
      "aliases": [
        "UBUNTU-CVE-2025-26465"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:7.2p2-4ubuntu2.10+esm7"
                }
              ]
            }
          ],
          "package": {
            "name": "openssh",
            "purl": "pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra%2Fxenial",
            "ecosystem": "Ubuntu:Pro:16.04:LTS"
          },
          "versions": [
            "1:6.9p1-2",
            "1:6.9p1-3",
            "1:7.1p1-1",
            "1:7.1p1-3",
            "1:7.1p1-4",
            "1:7.1p1-6",
            "1:7.1p2-1",
            "1:7.1p2-2",
            "1:7.2p1-1",
            "1:7.2p2-1",
            "1:7.2p2-2",
            "1:7.2p2-3",
            "1:7.2p2-4",
            "1:7.2p2-4ubuntu1",
            "1:7.2p2-4ubuntu2.1",
            "1:7.2p2-4ubuntu2.2",
            "1:7.2p2-4ubuntu2.4",
            "1:7.2p2-4ubuntu2.5",
            "1:7.2p2-4ubuntu2.6",
            "1:7.2p2-4ubuntu2.7",
            "1:7.2p2-4ubuntu2.8",
            "1:7.2p2-4ubuntu2.10",
            "1:7.2p2-4ubuntu2.10+esm1",
            "1:7.2p2-4ubuntu2.10+esm2",
            "1:7.2p2-4ubuntu2.10+esm3",
            "1:7.2p2-4ubuntu2.10+esm4",
            "1:7.2p2-4ubuntu2.10+esm5",
            "1:7.2p2-4ubuntu2.10+esm6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "openssh-client-ssh1",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "openssh-server",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "openssh-sftp-server",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "ssh",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "ssh-askpass-gnome",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              },
              {
                "binary_name": "ssh-krb5",
                "binary_version": "1:7.2p2-4ubuntu2.10+esm7"
              }
            ],
            "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:7.2p2-4ubuntu2.fips.2.10.7"
                }
              ]
            }
          ],
          "package": {
            "name": "openssh",
            "purl": "pkg:deb/ubuntu/openssh?arch=source&distro=fips-updates%2Fxenial",
            "ecosystem": "Ubuntu:Pro:FIPS-updates:16.04:LTS"
          },
          "versions": [
            "1:7.2p2-4ubuntu2.fips.2.2.3",
            "1:7.2p2-4ubuntu2.fips.2.4.1",
            "1:7.2p2-4ubuntu2.fips.2.4.2",
            "1:7.2p2-4ubuntu2.fips.2.8.1",
            "1:7.2p2-4ubuntu2.fips.2.10.1",
            "1:7.2p2-4ubuntu2.fips.2.10.2",
            "1:7.2p2-4ubuntu2.fips.2.10.3",
            "1:7.2p2-4ubuntu2.fips.2.10.4",
            "1:7.2p2-4ubuntu2.fips.2.10.5",
            "1:7.2p2-4ubuntu2.fips.2.10.6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "openssh-client-hmac",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "openssh-client-ssh1",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "openssh-server",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "openssh-server-hmac",
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              },
              {
                "binary_name": "openssh-sftp-server",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "ssh",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "ssh-askpass-gnome",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              },
              {
                "binary_name": "ssh-krb5",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.7"
              }
            ],
            "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "0"
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              ]
            }
          ],
          "package": {
            "name": "openssh",
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          },
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            "1:7.2p2-4ubuntu2.fips.2.2",
            "1:7.2p2-4ubuntu2.fips.2.2.1",
            "1:7.2p2-4ubuntu2.fips.2.10.1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
              },
              {
                "binary_name": "openssh-client-hmac",
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              },
              {
                "binary_name": "openssh-client-ssh1",
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              {
                "binary_name": "openssh-server",
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              {
                "binary_name": "openssh-server-hmac",
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              {
                "binary_name": "openssh-sftp-server",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
              },
              {
                "binary_name": "ssh",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
              },
              {
                "binary_name": "ssh-askpass-gnome",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
              },
              {
                "binary_name": "ssh-krb5",
                "binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
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            ]
          }
        },
        {
          "ranges": [
            {
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                {
                  "introduced": "0"
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                {
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              ]
            }
          ],
          "package": {
            "name": "openssh",
            "purl": "pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra%2Fbionic",
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          },
          "versions": [
            "1:7.5p1-10",
            "1:7.6p1-4",
            "1:7.6p1-4ubuntu0.1",
            "1:7.6p1-4ubuntu0.2",
            "1:7.6p1-4ubuntu0.3",
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            "1:7.6p1-4ubuntu0.7+esm1",
            "1:7.6p1-4ubuntu0.7+esm2",
            "1:7.6p1-4ubuntu0.7+esm3"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
                "binary_version": "1:7.6p1-4ubuntu0.7+esm4"
              },
              {
                "binary_name": "openssh-server",
                "binary_version": "1:7.6p1-4ubuntu0.7+esm4"
              },
              {
                "binary_name": "openssh-sftp-server",
                "binary_version": "1:7.6p1-4ubuntu0.7+esm4"
              },
              {
                "binary_name": "ssh",
                "binary_version": "1:7.6p1-4ubuntu0.7+esm4"
              },
              {
                "binary_name": "ssh-askpass-gnome",
                "binary_version": "1:7.6p1-4ubuntu0.7+esm4"
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            ],
            "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
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        },
        {
          "ranges": [
            {
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                {
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          ],
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            "name": "openssh-ssh1",
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          },
          "versions": [
            "1:7.5p1-8",
            "1:7.5p1-9",
            "1:7.5p1-9build1",
            "1:7.5p1-10"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client-ssh1",
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              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "0"
                },
                {
                  "fixed": "1:7.9p1-10~ubuntu18.04.fips.0.10"
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              ]
            }
          ],
          "package": {
            "name": "openssh",
            "purl": "pkg:deb/ubuntu/openssh?arch=source&distro=fips-updates%2Fbionic",
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          },
          "versions": [
            "1:7.9p1-10~ubuntu18.04.fips.0.1",
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            "1:7.9p1-10~ubuntu18.04.fips.0.8",
            "1:7.9p1-10~ubuntu18.04.fips.0.9"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "openssh-client-hmac",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "openssh-server",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "openssh-server-hmac",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "openssh-sftp-server",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "openssh-tests",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "ssh",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
              },
              {
                "binary_name": "ssh-askpass-gnome",
                "binary_version": "1:7.9p1-10~ubuntu18.04.fips.0.10"
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            ],
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        },
        {
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            {
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          ],
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            "name": "openssh",
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          },
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            "1:7.9p1-10~ubuntu18.04.fips.0.1",
            "1:7.9p1-10~ubuntu18.04.fips.0.2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
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              {
                "binary_name": "openssh-client-hmac",
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              {
                "binary_name": "openssh-server",
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              {
                "binary_name": "openssh-server-hmac",
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              {
                "binary_name": "openssh-sftp-server",
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              {
                "binary_name": "openssh-tests",
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              {
                "binary_name": "ssh",
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              {
                "binary_name": "ssh-askpass-gnome",
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        },
        {
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          ],
          "package": {
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            "1:8.0p1-6build1",
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          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
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              {
                "binary_name": "openssh-server",
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              {
                "binary_name": "openssh-sftp-server",
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              {
                "binary_name": "openssh-tests",
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              {
                "binary_name": "ssh",
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              {
                "binary_name": "ssh-askpass-gnome",
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        },
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          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
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          "ecosystem_specific": {
            "binaries": [
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          ],
          "package": {
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          "versions": [
            "1:8.2p1-4ubuntu0.fips.0.2.1",
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            "1:8.2p1-4ubuntu0.fips.0.10",
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          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
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          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "openssh-client",
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              {
                "binary_name": "openssh-server",
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              {
                "binary_name": "openssh-sftp-server",
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              {
                "binary_name": "openssh-tests",
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              {
                "binary_name": "ssh",
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                "binary_name": "ssh-askpass-gnome",
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            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
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            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26465.json"
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            "binaries": [
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      ],
      "modified": "2026-10-17T12:56:49.323127497Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-26465"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2025-26465",
        "https://www.cve.org/CVERecord?id=CVE-2025-26465",
        "https://ubuntu.com/security/notices/USN-7270-1",
        "https://ubuntu.com/security/notices/USN-7270-2"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-26465",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 356387,
  "published_at": "2025-02-18T00:00:00+00:00"
}