libssh: Fix of 2 CVEs

{
  "id": "c971b0d86a529e982798c19ae75f5b0cdbb462514645d9b69f2c10a5830308ff",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1786012208",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libssh: Fix of 2 CVEs",
    "summary": "- CVE-2026-59847: integrity downgrade of AES-GCM ciphers in the OpenSSL backend, where a wrong EVP_DecryptFinal() return-code check let a forged authentication tag pass and silently reduced AES-GCM to AES-CTR - CVE-2026-59850: use-after-free via channel data callbacks invoked on remotely-closed channels, where already-freed channel data could still be handed to application callbacks",
    "evidence": "osv:CLSA-2026-1786012208",
    "products": [
      {
        "name": {
          "value": "libssh",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.4-3.el8.tuxcare.els10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libssh-config",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.4-3.el8.tuxcare.els10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libssh-devel",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.9.4-3.el8.tuxcare.els10",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1786012208",
      "aliases": [
        "CLSA-2026-1786012208"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.4-3.el8.tuxcare.els10"
                }
              ]
            }
          ],
          "package": {
            "name": "libssh",
            "purl": "pkg:rpm/tuxcare/libssh?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1786012208.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.4-3.el8.tuxcare.els10"
                }
              ]
            }
          ],
          "package": {
            "name": "libssh-config",
            "purl": "pkg:rpm/tuxcare/libssh-config?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1786012208.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.9.4-3.el8.tuxcare.els10"
                }
              ]
            }
          ],
          "package": {
            "name": "libssh-devel",
            "purl": "pkg:rpm/tuxcare/libssh-devel?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1786012208.json"
          }
        }
      ],
      "modified": "2026-10-26T09:31:50.618667263Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-59847",
        "CVE-2026-59850"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/centos8.4els/CLSA-2026-1786012208.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59847",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59850"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-59847",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-59850",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 448657,
  "published_at": "2026-08-06T10:30:38+00:00"
}