USN-8937-1 (UBUNTU-CVE-2026-106552)

Vulnerability from osv_ubuntu – Published: 2026-10-19 13:34 – Updated: 2026-10-19 13:34 – Source website
VLAI
Summary
openssh, openssh-gssapi vulnerabilities
Details

It was discovered that OpenSSH's sftp client incorrectly handled paths returned by the server during a recursive copy operation. A remote attacker controlling the server could possibly use this issue to write files to unintended locations. (CVE-2026-106552)

It was discovered that OpenSSH's sshd server incorrectly handled GSSAPIAuthentication state across authentication attempts. An attacker could possibly use this issue to obtain credentials from a previous failed authentication attempt. (CVE-2026-106553, CVE-2026-106555)

It was discovered that OpenSSH incorrectly used an LZ77 dictionary coder during compression. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-106582)

It was discovered that OpenSSH's ssh client incorrectly allowed special characters in command-line usernames. An attacker could possibly use this issue to inject arbitrary commands via specially crafted usernames. (CVE-2026-106583)

It was discovered that OpenSSH's ssh-keygen incorrectly handled Daylight Saving Time when converting dates. An attacker could possibly use this issue to cause certificates to have incorrect expiration times. (CVE-2026-106584)

It was discovered that OpenSSH did not check whether the maximum packet length was exceeded during decompression. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-106585)

It was discovered that OpenSSH's sshd server incorrectly applied the restrict keyword from authorized_keys to tunnel forwarding requests. A local attacker with an authorized key could possibly use this issue to bypass intended tunnel forwarding restrictions. (CVE-2026-106586)

It was discovered that OpenSSH's sshd server incorrectly handled certain configuration options that accept a "none" value. An attacker could possibly use this issue to cause OpenSSH to behave unexpectedly. (CVE-2026-106587)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-106552",
              "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:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106553",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/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-2026-106555",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/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-2026-106582",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106583",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106584",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106585",
              "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-2026-106586",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106587",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.10"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "openssh-common",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "openssh-tests",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:10.5p1-1ubuntu3.1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:10.5p1-1ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:10.2p1-2ubuntu3",
        "1:10.3p1-4ubuntu1",
        "1:10.3p1-4ubuntu2",
        "1:10.5p1-1ubuntu2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-106552",
              "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:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106553",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/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-2026-106555",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/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-2026-106582",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106583",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106584",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106585",
              "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-2026-106586",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-106587",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.10"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client-gssapi",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          },
          {
            "binary_name": "openssh-server-gssapi",
            "binary_version": "1:10.5p1-1ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "openssh-gssapi",
        "purl": "pkg:deb/ubuntu/openssh-gssapi@1:10.5p1-1ubuntu3.1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:10.5p1-1ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:10.5p1-1ubuntu1",
        "1:10.5p1-1ubuntu2",
        "1:10.5p1-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that OpenSSH\u0027s sftp client incorrectly handled paths\nreturned by the server during a recursive copy operation. A remote attacker\ncontrolling the server could possibly use this issue to write files to\nunintended locations. (CVE-2026-106552)\n\nIt was discovered that OpenSSH\u0027s sshd server incorrectly handled\nGSSAPIAuthentication state across authentication attempts. An attacker\ncould possibly use this issue to obtain credentials from a previous failed\nauthentication attempt. (CVE-2026-106553, CVE-2026-106555)\n\nIt was discovered that OpenSSH incorrectly used an LZ77 dictionary coder\nduring compression. An attacker could possibly use this issue to obtain\nsensitive information. (CVE-2026-106582)\n\nIt was discovered that OpenSSH\u0027s ssh client incorrectly allowed special\ncharacters in command-line usernames. An attacker could possibly use this\nissue to inject arbitrary commands via specially crafted usernames.\n(CVE-2026-106583)\n\nIt was discovered that OpenSSH\u0027s ssh-keygen incorrectly handled Daylight\nSaving Time when converting dates. An attacker could possibly use this\nissue to cause certificates to have incorrect expiration times.\n(CVE-2026-106584)\n\nIt was discovered that OpenSSH did not check whether the maximum packet\nlength was exceeded during decompression. A remote attacker could possibly\nuse this issue to cause a denial of service. (CVE-2026-106585)\n\nIt was discovered that OpenSSH\u0027s sshd server incorrectly applied the\nrestrict keyword from authorized_keys to tunnel forwarding requests. A\nlocal attacker with an authorized key could possibly use this issue to\nbypass intended tunnel forwarding restrictions. (CVE-2026-106586)\n\nIt was discovered that OpenSSH\u0027s sshd server incorrectly handled certain\nconfiguration options that accept a \"none\" value. An attacker could\npossibly use this issue to cause OpenSSH to behave unexpectedly.\n(CVE-2026-106587)",
  "id": "USN-8937-1",
  "modified": "2026-10-19T13:34:39Z",
  "published": "2026-10-19T13:34:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8937-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106552"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106553"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106555"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106582"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106583"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106584"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106585"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106586"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106587"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssh, openssh-gssapi vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-106552",
    "UBUNTU-CVE-2026-106553",
    "UBUNTU-CVE-2026-106555",
    "UBUNTU-CVE-2026-106582",
    "UBUNTU-CVE-2026-106583",
    "UBUNTU-CVE-2026-106584",
    "UBUNTU-CVE-2026-106585",
    "UBUNTU-CVE-2026-106586",
    "UBUNTU-CVE-2026-106587"
  ]
}



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