Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification

{
  "id": "85d97c977b39390246b3469d9dc6d5e096fe25a0c8ffdf6d2d493becf6e4e122",
  "url": "https://osv.dev/vulnerability/CVE-2026-59847",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification",
    "summary": "A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.",
    "evidence": "osv:CVE-2026-59847",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-59847",
      "aliases": [
        "CVE-2026-59847"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/libssh/libssh-mirror",
              "type": "GIT",
              "events": [
                {
                  "introduced": "79900e5246da9a1712d8822a53aaf5fd0abc6f40"
                },
                {
                  "fixed": "a09fdd00416e53b6ed436df6ff14339a4f884601"
                },
                {
                  "introduced": "50313883f3a077458cde4ea95bf46bfeb0771b34"
                },
                {
                  "last_affected": "50313883f3a077458cde4ea95bf46bfeb0771b34"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9.0"
                      },
                      {
                        "fixed": "0.11.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:libssh:libssh:0.12.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.12.0"
                      },
                      {
                        "last_affected": "0.12.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.12.0",
            "libssh-0.12.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59847.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.608486878Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://catalog.redhat.com/software/containers/",
        "https://access.redhat.com/errata/RHSA-2026:42922",
        "https://access.redhat.com/errata/RHSA-2026:55855",
        "https://access.redhat.com/errata/RHSA-2026:62217",
        "https://access.redhat.com/errata/RHSA-2026:62218",
        "https://access.redhat.com/security/cve/CVE-2026-59847",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59847.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59847",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2498180"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-253"
        ],
        "cna_assigner": "redhat",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0:0.12.0-3.el10_2"
                  },
                  {
                    "fixed": "0:0.9.6-17.el8_10"
                  },
                  {
                    "fixed": "0:0.9.6-17.el8_10"
                  },
                  {
                    "fixed": "0:0.10.4-19.el9_8"
                  },
                  {
                    "fixed": "0:0.10.4-19.el9_8"
                  },
                  {
                    "fixed": "0.12.1-4.hum1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "InverseAffectedRanges"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59847.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-59847",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497755,
  "published_at": "2026-07-21T13:18:18.146+00:00"
}