USN-8804-1 (UBUNTU-CVE-2026-35386)

Vulnerability from osv_ubuntu – Published: 2026-09-22 14:24 – Updated: 2026-09-22 14:24 – Source website
VLAI
Summary
openssh vulnerabilities
Details

Florian Kohnhäuser discovered that OpenSSH incorrectly handled shell metacharacters in certain usernames. An attacker could possibly use this issue to execute arbitrary commands when certain non-default configurations were used, resulting in arbitrary code execution. This issue only affected Ubuntu 14.04 LTS. (CVE-2026-35386)

Christos Papakonstantinou discovered that OpenSSH incorrectly handled ECDSA algorithm restrictions. An attacker could possibly use this issue to cause unintended ECDSA algorithms to be accepted, resulting in security restrictions being bypassed. (CVE-2026-35387)

Vladimir Tokarev discovered that OpenSSH incorrectly handled certain principal restrictions in authorized_keys files. An attacker could possibly use this issue to bypass principal restrictions, resulting in unauthorized access. This issue only affected Ubuntu 14.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-35414)

It was discovered that OpenSSH incorrectly handled downloaded file paths when using sftp with an untrusted server. An attacker could possibly use this issue to write downloaded files outside the intended location, resulting in unauthorized file modification. (CVE-2026-59995)

It was discovered that OpenSSH incorrectly handled command-line arguments in internal-sftp. An attacker could possibly use this issue to cause certain security-related arguments to be ignored, resulting in security restrictions being bypassed. (CVE-2026-59997)

It was discovered that OpenSSH incorrectly handled GSSAPIStrictAcceptorCheck when used with Windows Active Directory. An attacker could possibly use this issue to bypass GSSAPI security restrictions, resulting in unauthorized access. (CVE-2026-59998)

It was discovered that OpenSSH incorrectly handled forwarding restrictions when DisableForwarding and PermitTunnel were used together. An attacker could possibly use this issue to create tunnels despite forwarding being disabled, resulting in security restrictions being bypassed. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-59999)

It was discovered that OpenSSH incorrectly handled authentication attempt limits when using GSSAPI authentication. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. (CVE-2026-60000)

It was discovered that OpenSSH did not always enforce the minimum authentication delay. An attacker could possibly use this issue to perform authentication attempts more rapidly than intended, resulting in weakened brute-force protections. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-60001)

It was discovered that OpenSSH incorrectly handled certain concurrent remote forwarding operations. An attacker could possibly use this issue to trigger a use-after-free, resulting in a denial of service or arbitrary code execution. (CVE-2026-73282)

References
To clipboard 

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  "affected": [
    {
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                  "type": "CVSS_V3"
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                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
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                },
                {
                  "score": "medium",
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              ]
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              "id": "CVE-2026-35414",
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-59995",
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                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
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                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-59997",
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                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
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              ]
            },
            {
              "id": "CVE-2026-59998",
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                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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                },
                {
                  "score": "medium",
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              ]
            },
            {
              "id": "CVE-2026-59999",
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                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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                },
                {
                  "score": "medium",
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              ]
            },
            {
              "id": "CVE-2026-60000",
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                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-73282",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
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        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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            "binary_version": "1:7.6p1-4ubuntu0.7+esm6"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:7.6p1-4ubuntu0.7+esm6"
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            "binary_version": "1:7.6p1-4ubuntu0.7+esm6"
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      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "openssh",
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      },
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        "1:7.6p1-4ubuntu0.2",
        "1:7.6p1-4ubuntu0.3",
        "1:7.6p1-4ubuntu0.5",
        "1:7.6p1-4ubuntu0.6",
        "1:7.6p1-4ubuntu0.7",
        "1:7.6p1-4ubuntu0.7+esm1",
        "1:7.6p1-4ubuntu0.7+esm2",
        "1:7.6p1-4ubuntu0.7+esm3",
        "1:7.6p1-4ubuntu0.7+esm4",
        "1:7.6p1-4ubuntu0.7+esm5"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-35387",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                }
              ]
            },
            {
              "id": "CVE-2026-59995",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-59997",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-59998",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-59999",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-60000",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-60001",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-73282",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          },
          {
            "binary_name": "openssh-tests",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:8.2p1-4ubuntu0.13+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.13+esm3?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:8.2p1-4ubuntu0.13+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:8.0p1-6build1",
        "1:8.1p1-1",
        "1:8.1p1-5",
        "1:8.2p1-4",
        "1:8.2p1-4ubuntu0.1",
        "1:8.2p1-4ubuntu0.2",
        "1:8.2p1-4ubuntu0.3",
        "1:8.2p1-4ubuntu0.4",
        "1:8.2p1-4ubuntu0.5",
        "1:8.2p1-4ubuntu0.7",
        "1:8.2p1-4ubuntu0.8",
        "1:8.2p1-4ubuntu0.9",
        "1:8.2p1-4ubuntu0.10",
        "1:8.2p1-4ubuntu0.11",
        "1:8.2p1-4ubuntu0.12",
        "1:8.2p1-4ubuntu0.13",
        "1:8.2p1-4ubuntu0.13+esm1",
        "1:8.2p1-4ubuntu0.13+esm2"
      ]
    }
  ],
  "aliases": [],
  "details": "Florian Kohnh\u00e4user discovered that OpenSSH incorrectly handled shell\nmetacharacters in certain usernames. An attacker could possibly use this\nissue to execute arbitrary commands when certain non-default\nconfigurations were used, resulting in arbitrary code execution. This\nissue only affected Ubuntu 14.04 LTS. (CVE-2026-35386)\n\nChristos Papakonstantinou discovered that OpenSSH incorrectly handled\nECDSA algorithm restrictions. An attacker could possibly use this issue\nto cause unintended ECDSA algorithms to be accepted, resulting in\nsecurity restrictions being bypassed. (CVE-2026-35387)\n\nVladimir Tokarev discovered that OpenSSH incorrectly handled certain\nprincipal restrictions in authorized_keys files. An attacker could\npossibly use this issue to bypass principal restrictions, resulting in\nunauthorized access. This issue only affected Ubuntu 14.04 LTS, Ubuntu\n18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-35414)\n\nIt was discovered that OpenSSH incorrectly handled downloaded file paths\nwhen using sftp with an untrusted server. An attacker could possibly use\nthis issue to write downloaded files outside the intended location,\nresulting in unauthorized file modification. (CVE-2026-59995)\n\nIt was discovered that OpenSSH incorrectly handled command-line\narguments in internal-sftp. An attacker could possibly use this issue to\ncause certain security-related arguments to be ignored, resulting in\nsecurity restrictions being bypassed. (CVE-2026-59997)\n\nIt was discovered that OpenSSH incorrectly handled\nGSSAPIStrictAcceptorCheck when used with Windows Active Directory. An\nattacker could possibly use this issue to bypass GSSAPI security\nrestrictions, resulting in unauthorized access. (CVE-2026-59998)\n\nIt was discovered that OpenSSH incorrectly handled forwarding\nrestrictions when DisableForwarding and PermitTunnel were used together.\nAn attacker could possibly use this issue to create tunnels despite\nforwarding being disabled, resulting in security restrictions being\nbypassed. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04\nLTS. (CVE-2026-59999)\n\nIt was discovered that OpenSSH incorrectly handled authentication\nattempt limits when using GSSAPI authentication. An attacker could\npossibly use this issue to consume excessive system resources, resulting\nin a denial of service. (CVE-2026-60000)\n\nIt was discovered that OpenSSH did not always enforce the minimum\nauthentication delay. An attacker could possibly use this issue to\nperform authentication attempts more rapidly than intended, resulting in\nweakened brute-force protections. This issue only affected Ubuntu 20.04\nLTS. (CVE-2026-60001)\n\nIt was discovered that OpenSSH incorrectly handled certain concurrent\nremote forwarding operations. An attacker could possibly use this issue\nto trigger a use-after-free, resulting in a denial of service or\narbitrary code execution. (CVE-2026-73282)",
  "id": "USN-8804-1",
  "modified": "2026-09-22T14:24:54Z",
  "published": "2026-09-22T14:24:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8804-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35386"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35387"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35414"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59995"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59997"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59998"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-59999"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-60000"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-60001"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-73282"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssh vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-35386",
    "UBUNTU-CVE-2026-35387",
    "UBUNTU-CVE-2026-35414",
    "UBUNTU-CVE-2026-59995",
    "UBUNTU-CVE-2026-59997",
    "UBUNTU-CVE-2026-59998",
    "UBUNTU-CVE-2026-59999",
    "UBUNTU-CVE-2026-60000",
    "UBUNTU-CVE-2026-60001",
    "UBUNTU-CVE-2026-73282"
  ]
}



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