{
  "acceptance_criteria": [
    "Affected product or dependency presence is confirmed by a human.",
    "Affected version is confirmed or marked not applicable.",
    "Official advisory or source reference is reviewed.",
    "Patch, fixed version, mitigation, workaround, or monitor-only decision is documented.",
    "Validation steps are proposed without external scanning or production mutation."
  ],
  "affected_context": {
    "component": null,
    "cpe": [],
    "ecosystems": [],
    "product": null,
    "purl": [],
    "vendor": null,
    "versions": []
  },
  "canonical_signal_url": "https://vuln.signal-radar.com/vuln/public-candidate/CVE-2026-18427/",
  "cve_id": "CVE-2026-18427",
  "generated_at": "2026-08-13T16:17:07.471035+00:00",
  "human_checklist": [
    "Confirm whether the listed product or package is present.",
    "Confirm affected version.",
    "Review vendor advisory or official source.",
    "Confirm patch, fixed version, mitigation, workaround, or monitor-only decision.",
    "Confirm exposure.",
    "Document remediation status."
  ],
  "pack_version": "remediation-handoff/0.1",
  "redaction_policy": {
    "exploit_steps_removed": true,
    "payloads_removed": true,
    "scanner_instructions_removed": true,
    "source_published_defensive_context_allowed": true
  },
  "remediation_context": {
    "fixed_versions": [],
    "mitigation_notes": [
      "Remediation reference present; patch status requires confirmation in the linked advisory.",
      "Patch status requires confirmation from the linked advisory or official source."
    ],
    "patch_status": "requires_confirmation",
    "recommended_route": "vendor_patch_or_mitigation",
    "reference_status": "official_reference_present"
  },
  "risk_context": {
    "cvss_label": "HIGH",
    "cvss_score": 7.5,
    "epss_percentile": 0.37706,
    "kev_status": "not_listed",
    "risk_flags": [
      "CVSS HIGH",
      "official reference present"
    ],
    "severity": "HIGH"
  },
  "rollback_note": "If remediation work is later performed, define a project-specific rollback plan before changing any production system.",
  "safe_agent_handoff": {
    "allowed_actions": [
      "summarize vendor guidance",
      "prepare a defensive remediation plan",
      "identify affected dependencies only when repo context is separately provided by the user",
      "suggest tests and validation steps",
      "document human verification questions"
    ],
    "auto_remediation_allowed": false,
    "disallowed_actions": [
      "generate offensive code",
      "provide payloads",
      "scan external targets",
      "change production systems",
      "merge or deploy changes",
      "create GitHub issues or pull requests without explicit separate approval"
    ],
    "external_execution_allowed": false,
    "goal": "Prepare a defensive remediation plan for CVE-2026-18427 using only provided public-safe source context and any separate repo context supplied by the user.",
    "human_approval_required": true,
    "scan_allowed": false
  },
  "safety_notes": [
    "Defensive triage and remediation planning only.",
    "No offensive procedure, payload material, external target scan, or auto-remediation instruction is included.",
    "KEV not listed means not listed in the KEV catalog for this record; it does not prove absence of exploitation."
  ],
  "source_context": {
    "references": [
      "https://cna.openjsf.org/security-advisories.html",
      "https://github.com/fastify/fastify-static/security/advisories/GHSA-423g-23ch-w7c6"
    ],
    "source_names": [
      "NVD",
      "Vendor Advisory"
    ],
    "source_published_impact": "Source describes remote exposure · authenticated boundary. Possible impact: This high severity issue needs human triage to confirm exposure, affected versions, and vendor guidance for remote exposure · authenticated boundary.",
    "source_published_summary": "NVD: @fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. NVD: The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegating to the send layer. NVD: As a result, an unauthenticated attacker could request a file protected by a route based guard using a non canonical path form that misses the guarded route yet resolves back onto the protected file, disclosing its contents."
  }
}