usn-8447-3
Vulnerability from osv_ubuntu
Published
2026-06-22 17:23
Modified
2026-06-30 15:55
Summary
google-guest-agent vulnerabilities
Details

USN-8447-1 fixed vulnerabilities in Go Cryptography. This update provides the corresponding updates for Go Cryptography code embedded in Google Guest Agent.

Original advisory details:

It was discovered that Go Cryptography did not properly handle SSH global request responses. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39830)

It was discovered that Go Cryptography did not properly verify user presence when using FIDO/U2F security keys. An attacker could possibly use this issue to bypass user presence verification for hardware security keys. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39831)

It was discovered that Go Cryptography did not properly serialize SSH agent key constraint extensions. An attacker could possibly use this issue to bypass intended key usage restrictions. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-39832)

It was discovered that Go Cryptography did not properly enforce the confirm-before-use constraint in the SSH agent keyring. An attacker could possibly use this issue to use SSH keys without the required user confirmation. (CVE-2026-39833)

It was discovered that Go Cryptography had an integer overflow when handling large SSH channel writes. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-39834)

It was discovered that Go Cryptography did not properly check certificate authority key revocation. An attacker could possibly use this issue to bypass certificate authority revocation checks. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-42508)

It was discovered that Go Cryptography did not properly enforce the source- address critical option for all SSH server callback types. An attacker could possibly use this issue to bypass source address authorization restrictions. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-46595)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-39830",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "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-2026-39831",
              "severity": [
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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",
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          {
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            "binary_version": "20240716.00-0ubuntu1~16.04.0+esm3"
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                {
                  "score": "medium",
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            {
              "id": "CVE-2026-39834",
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          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
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      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "google-guest-agent",
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        "20210629.00-0ubuntu1~18.04.1",
        "20220622.00-0ubuntu2~18.04.0",
        "20220622.00-0ubuntu2~18.04.1",
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      ]
    },
    {
      "database_specific": {
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            {
              "id": "CVE-2026-39830",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "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-2026-39831",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "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": "google-guest-agent",
            "binary_version": "20250116.00-0ubuntu1~20.04.0+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "google-guest-agent",
        "purl": "pkg:deb/ubuntu/google-guest-agent@20250116.00-0ubuntu1~20.04.0+esm3?arch=source\u0026distro=esm-infra/focal"
      },
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          ],
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        "20220622.00-0ubuntu2~20.04.0",
        "20220622.00-0ubuntu2~20.04.2",
        "20230426.00-0ubuntu2~20.04.0",
        "20231004.02-0ubuntu1~20.04.1",
        "20231004.02-0ubuntu1~20.04.2",
        "20231004.02-0ubuntu1~20.04.3",
        "20231004.02-0ubuntu1~20.04.4",
        "20240716.00-0ubuntu1~20.04.0",
        "20241011.01-0ubuntu1~20.04.1",
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        "20250116.00-0ubuntu1~20.04.0+esm2"
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            {
              "id": "CVE-2026-39830",
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                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39831",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
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                }
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          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
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        "availability": "No subscription required",
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            "binary_name": "google-guest-agent",
            "binary_version": "20250116.00-0ubuntu1~22.04.3"
          }
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    {
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            {
              "id": "CVE-2026-39830",
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                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "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-2026-39831",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46595",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "google-guest-agent",
            "binary_version": "20250116.00-0ubuntu1~24.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "google-guest-agent",
        "purl": "pkg:deb/ubuntu/google-guest-agent@20250116.00-0ubuntu1~24.04.4?arch=source\u0026distro=noble"
      },
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      ],
      "versions": [
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        "20231004.02-0ubuntu1",
        "20231004.02-0ubuntu3",
        "20240213.00-0ubuntu1",
        "20240213.00-0ubuntu2",
        "20240213.00-0ubuntu3",
        "20240213.00-0ubuntu3.1",
        "20240213.00-0ubuntu3.2",
        "20240716.00-0ubuntu1~24.04.0",
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        "20241011.01-0ubuntu1~24.04.0",
        "20250116.00-0ubuntu1~24.04.0",
        "20250116.00-0ubuntu1~24.04.1",
        "20250116.00-0ubuntu1~24.04.2",
        "20250116.00-0ubuntu1~24.04.3"
      ]
    },
    {
      "database_specific": {
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            {
              "id": "CVE-2026-39830",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "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-2026-39831",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46595",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:25.10"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "google-guest-agent",
            "binary_version": "20250506.01-0ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "google-guest-agent",
        "purl": "pkg:deb/ubuntu/google-guest-agent@20250506.01-0ubuntu1.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
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            {
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          ],
          "type": "ECOSYSTEM"
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      ],
      "versions": [
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        "20250506.01-0ubuntu1",
        "20250506.01-0ubuntu1.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-39830",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
                  "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-2026-39831",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39834",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-46595",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "google-guest-agent",
            "binary_version": "20250506.01-0ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "google-guest-agent",
        "purl": "pkg:deb/ubuntu/google-guest-agent@20250506.01-0ubuntu2.1?arch=source\u0026distro=resolute"
      },
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        }
      ],
      "versions": [
        "20250506.01-0ubuntu1",
        "20250506.01-0ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8447-1 fixed vulnerabilities in Go Cryptography. This update provides\nthe corresponding updates for Go Cryptography code embedded in Google\nGuest Agent.\n\nOriginal advisory details:\n\n It was discovered that Go Cryptography did not properly handle SSH global\n request responses. A remote attacker could possibly use this issue to cause\n a denial of service. (CVE-2026-39830)\n\n It was discovered that Go Cryptography did not properly verify user\n presence when using FIDO/U2F security keys. An attacker could possibly use\n this issue to bypass user presence verification for hardware security keys.\n This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04\n LTS, and Ubuntu 26.04 LTS. (CVE-2026-39831)\n\n It was discovered that Go Cryptography did not properly serialize SSH agent\n key constraint extensions. An attacker could possibly use this issue to\n bypass intended key usage restrictions. This issue only affected Ubuntu\n 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n (CVE-2026-39832)\n\n It was discovered that Go Cryptography did not properly enforce the\n confirm-before-use constraint in the SSH agent keyring. An attacker could\n possibly use this issue to use SSH keys without the required user\n confirmation. (CVE-2026-39833)\n\n It was discovered that Go Cryptography had an integer overflow when\n handling large SSH channel writes. A remote attacker could possibly use\n this issue to cause a denial of service. (CVE-2026-39834)\n\n It was discovered that Go Cryptography did not properly check certificate\n authority key revocation. An attacker could possibly use this issue to\n bypass certificate authority revocation checks. This issue only affected\n Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\n Ubuntu 26.04 LTS. (CVE-2026-42508)\n\n It was discovered that Go Cryptography did not properly enforce the source-\n address critical option for all SSH server callback types. An attacker\n could possibly use this issue to bypass source address authorization\n restrictions. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-46595)",
  "id": "USN-8447-3",
  "modified": "2026-06-30T15:55:21Z",
  "published": "2026-06-22T17:23:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8447-3"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39830"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39831"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39834"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46595"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "google-guest-agent vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-39830",
    "UBUNTU-CVE-2026-39831",
    "UBUNTU-CVE-2026-39834",
    "UBUNTU-CVE-2026-46595"
  ]
}



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Tags
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.


Detection rules are retrieved from Rulezet.