ETK-2026-3871Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3871",
  "cve_id": null,
  "display_id": "ETK-2026-3871",
  "ghsa_id": "GHSA-5wm9-6g4v-jq7c",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Validation-after-write file overwrite in Rust zip",
  "summary": "The Rust `zip` crate's `ZipStreamReader` extraction can write files before header-consistency validation rejects a malformed ZIP archive. An attacker who can supply an archive may create or overwrite files in the extraction destination when the application extracts it with `enforce_header_consistency(true)`.",
  "mitigation": "Update the Rust `zip` crate to version 9.1.0. Until updated, do not extract untrusted archives with `ZipStreamReader` into directories containing files that must not be modified.",
  "vendor": "rust",
  "product": "rust:zip",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "= 9.0.5"
      ],
      "ecosystem": "rust",
      "fixed_versions": [
        "9.1.0"
      ],
      "package_name": "zip",
      "purl": "pkg:cargo/zip"
    }
  ],
  "cwes": [
    436
  ],
  "cvss_score": 9.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 4.919444783333334,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-11-08T02:22:55.560802+00:00",
      "days": -0.26968982751157405,
      "is_lower_bound": true,
      "measured_at": "2026-11-08T08:51:17.285027+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-11-07T21:53:04+00:00",
      "days": -0.4570921516087963,
      "is_lower_bound": true,
      "measured_at": "2026-11-08T08:51:17.285027+00:00",
      "url": "https://github.com/zip-rs/zip2/security/advisories/GHSA-5wm9-6g4v-jq7c"
    },
    "trigger_signal": {
      "at": "2026-11-07T21:53:04+00:00",
      "days": -0.4570921516087963,
      "is_lower_bound": true,
      "measured_at": "2026-11-08T08:51:17.285027+00:00",
      "url": "https://github.com/zip-rs/zip2/security/advisories/GHSA-5wm9-6g4v-jq7c"
    }
  }
}