libssh vulnerability

{
  "id": "fc4d3f78f7f6befe704581d552d193c2eab7df7daff6c2ea729c1560f07dcae2",
  "url": "https://osv.dev/vulnerability/USN-8093-2",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libssh vulnerability",
    "summary": "USN-8093-1 fixed a vulnerability in libssh. This update provides the corresponsing fix for Ubuntu 26.04 LTS. Original advisory details: It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds, it could cause the application to crash, resulting in a denial of service, or exhibit unintended behavior.",
    "evidence": "osv:USN-8093-2",
    "products": [
      {
        "name": {
          "value": "libssh",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.11.3-1ubuntu2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "0.11.2-1build1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.11.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.11.3-1ubuntu1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "USN-8093-2",
      "aliases": [
        "USN-8093-2"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.11.3-1ubuntu2"
                }
              ]
            }
          ],
          "package": {
            "name": "libssh",
            "purl": "pkg:deb/ubuntu/libssh?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "0.11.2-1build1",
            "0.11.3-1",
            "0.11.3-1ubuntu1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-2.json",
            "cves_map": {
              "cves": [
                {
                  "id": "CVE-2026-3731",
                  "severity": [
                    {
                      "type": "CVSS_V3",
                      "score": "CVSS:3.1/AV:N/AC:L/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_V4",
                      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                    },
                    {
                      "type": "Ubuntu",
                      "score": "medium"
                    }
                  ]
                }
              ],
              "ecosystem": "Ubuntu:26.04:LTS"
            }
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libssh-4",
                "binary_version": "0.11.3-1ubuntu2"
              }
            ],
            "availability": "No subscription required"
          }
        }
      ],
      "modified": "2026-10-27T04:16:53.805251432Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-3731",
        "UBUNTU-CVE-2026-3731"
      ],
      "references": [
        "https://ubuntu.com/security/notices/USN-8093-2",
        "https://ubuntu.com/security/CVE-2026-3731"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-3731",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 460211,
  "published_at": "2026-08-19T08:15:33+00:00"
}