USN-8222-1 (UBUNTU-CVE-2026-35385)

Vulnerability from osv_ubuntu – Published: 2026-04-29 12:10 – Updated: 2026-06-30 15:55 – Source website
VLAI
Summary
openssh vulnerabilities
Details

Christos Papakonstantinou discovered that the OpenSSH scp tool incorrectly handled the legacy scp protocol (-O) option. This could result in certain files being installed setuid or setgid, contrary to expectations. (CVE-2026-35385)

Florian Kohnhäuser discovered that OpenSSH incorrectly handled shell metacharacters in usernames within a command line. When untrusted usernames and non-default configurations using % in ssh_config are being used, an attacker could possibly use this issue to execute arbitrary code. (CVE-2026-35386)

Christos Papakonstantinou discovered that OpenSSH incorrectly handled parsing the PubkeyAcceptedAlgorithms and HostbasedAcceptedAlgorithms options. This could result in unintended ECDSA algorithms being used, contrary to expectations. (CVE-2026-35387)

Michalis Vasileiadis discovered that OpenSSH incorrectly handled proxy-mode multiplexing sessions. This could result in no confirmation being asked, contrary to expectations. (CVE-2026-35388)

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 

{
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      "database_specific": {
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          "cves": [
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            },
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                  "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"
                },
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                  "score": "medium",
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                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:25.10"
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      },
      "ecosystem_specific": {
        "availability": "No subscription required",
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        "1:10.0p1-5ubuntu5.1"
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    },
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                },
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
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            {
              "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:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
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            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
          {
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            "binary_version": "1:10.2p1-2ubuntu3.2"
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            "binary_name": "openssh-server-gssapi",
            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
          {
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            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
          {
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            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
          {
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            "binary_version": "1:10.2p1-2ubuntu3.2"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:10.2p1-2ubuntu3.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "openssh",
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      },
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            }
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          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:10.0p1-5ubuntu5",
        "1:10.2p1-2ubuntu1",
        "1:10.2p1-2ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "Christos Papakonstantinou discovered that the OpenSSH scp tool incorrectly\nhandled the legacy scp protocol (-O) option. This could result in certain\nfiles being installed setuid or setgid, contrary to expectations.\n(CVE-2026-35385)\n\nFlorian Kohnh\u00e4user discovered that OpenSSH incorrectly handled shell\nmetacharacters in usernames within a command line. When untrusted usernames\nand non-default configurations using % in ssh_config are being used, an\nattacker could possibly use this issue to execute arbitrary code.\n(CVE-2026-35386)\n\nChristos Papakonstantinou discovered that OpenSSH incorrectly handled\nparsing the PubkeyAcceptedAlgorithms and HostbasedAcceptedAlgorithms\noptions. This could result in unintended ECDSA algorithms being used,\ncontrary to expectations. (CVE-2026-35387)\n\nMichalis Vasileiadis discovered that OpenSSH incorrectly handled\nproxy-mode multiplexing sessions. This could result in no confirmation\nbeing asked, contrary to expectations. (CVE-2026-35388)\n\nVladimir Tokarev discovered that OpenSSH incorrectly handled certificates\nwith the principal name containing a comma character when using user-trusted\nCA keys in authorized_keys and an authorized_keys principals=\"\" option\nthat lists more than one principal. This could result in inappropriate\nprincipal matching, contrary to expectations. (CVE-2026-35414)",
  "id": "USN-8222-1",
  "modified": "2026-06-30T15:55:18Z",
  "published": "2026-04-29T12:10:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8222-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35385"
    },
    {
      "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-2026-35388"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35414"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssh vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-35385",
    "UBUNTU-CVE-2026-35386",
    "UBUNTU-CVE-2026-35387",
    "UBUNTU-CVE-2026-35388",
    "UBUNTU-CVE-2026-35414"
  ]
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.