CVE-2026-115557

{
  "etk_id": "ETK-2026-2547",
  "cve_id": "CVE-2026-115557",
  "display_id": "CVE-2026-115557",
  "ghsa_id": "GHSA-x547-2835-q547",
  "euvd_id": "EUVD-2026-109299",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Missing certificate distrust in CPython ssl",
  "summary": "CPython's ssl module may accept certificates known to be compromised when certificate revocation checking is not configured. A network attacker able to present such a certificate chain could undermine TLS peer authentication for affected connections.",
  "mitigation": "Enable certificate revocation checking for SSL contexts and restrict trusted certificate authorities to those required by the application. Upgrade to a CPython release that includes the ssl certificate distrust list when the applicable release is identified.",
  "vendor": "Python Software Foundation",
  "product": "CPython",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, <= 3.16.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "CPython",
      "purl": null
    }
  ],
  "cwes": [
    299
  ],
  "cvss_score": 9.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 18.749757816666666,
  "t0_at": "2026-10-24T14:15:14.283000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-24T14:15:14.283000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-24T14:15:14.283000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-115557"
    }
  }
}