usn-8577-1
Vulnerability from osv_ubuntu
Published
2026-07-21 12:17
Modified
2026-07-21 12:17
Summary
openssh vulnerability
Details

USN-8222-1 fixed a vulnerability in OpenSSH. This update provides the corresponding fix for Ubuntu 16.04 LTS.

Original advisory details:

Vladimir Tokarev discovered that OpenSSH incorrectly handled certificates with the principal name containing a comma character when using user-trusted CA keys in authorized_keys and an authorized_keys principals="" option that lists more than one principal. This could result in inappropriate principal matching, contrary to expectations. (CVE-2026-35414)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-35414",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          },
          {
            "binary_name": "ssh-krb5",
            "binary_version": "1:7.2p2-4ubuntu2.10+esm9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.10+esm9?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:7.2p2-4ubuntu2.10+esm9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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",
        "1:7.2p2-4ubuntu2.10+esm7",
        "1:7.2p2-4ubuntu2.10+esm8"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8222-1 fixed a vulnerability in OpenSSH. This update provides the\ncorresponding fix for Ubuntu 16.04 LTS.\n\nOriginal advisory details:\n\n Vladimir Tokarev discovered that OpenSSH incorrectly handled certificates\n with the principal name containing a comma character when using user-trusted\n CA keys in authorized_keys and an authorized_keys principals=\"\" option\n that lists more than one principal. This could result in inappropriate\n principal matching, contrary to expectations. (CVE-2026-35414)",
  "id": "USN-8577-1",
  "modified": "2026-07-21T12:17:17Z",
  "published": "2026-07-21T12:17:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8577-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35414"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssh vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-35414"
  ]
}



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