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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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          "date": "2026-07-21T13:17:00Z",
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        "full_product_name": {
          "name": "libssh-doc-0:0.9.3-2ubuntu2.5+tuxcare.els6.all as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:libssh-doc-0:0.9.3-2ubuntu2.5+tuxcare.els6.all"
        },
        "product_reference": "libssh-doc-0:0.9.3-2ubuntu2.5+tuxcare.els6.all",
        "relates_to_product_reference": "Ubuntu-20"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-59846",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command ('Command Injection')"
      },
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "known_affected": [
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          "Ubuntu-20:libssh-4-0:0.9.3-2ubuntu2.5+tuxcare.els2.amd64",
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          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5+tuxcare.els2.amd64",
          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5+tuxcare.els3.amd64",
          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5+tuxcare.els4.amd64",
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          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5+tuxcare.els6.amd64",
          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5+tuxcare.els7.amd64",
          "Ubuntu-20:libssh-gcrypt-dev-0:0.9.3-2ubuntu2.5.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-59846"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:42922",
          "url": "https://access.redhat.com/errata/RHSA-2026:42922"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-59846",
          "url": "https://access.redhat.com/security/cve/CVE-2026-59846"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2498179",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498179"
        }
      ],
      "release_date": "2026-07-21T13:17:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-31T18:43:04.829812Z",
          "details": "This issue only manifests when a libssh-based client is explicitly configured to use ProxyCommand with the %r token; that setting is not enabled by default. Exploitation is local and requires user interaction to trigger a connection using a crafted username, with at most limited confidentiality/integrity impact and no availability impact. In server/VM contexts where libssh is used by services rather than interactive clients, the ProxyCommand expansion path is not exercised, so the practical risk is minimal.",
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  ]
}