CVE-2026-115889

{
  "etk_id": "ETK-2026-2217",
  "cve_id": "CVE-2026-115889",
  "display_id": "CVE-2026-115889",
  "ghsa_id": "GHSA-897f-g5gm-fmxm",
  "euvd_id": "EUVD-2026-109186",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Cranelift SSA index overflow in Wasmtime",
  "summary": "Wasmtime using its default Cranelift compiler backend is affected by an SSA value-index overflow that can cause incorrect compilation. An attacker able to have a specially constructed, very large WebAssembly module compiled may cause type confusion or other effects that escape the Wasm sandbox.",
  "mitigation": "Upgrade the rust wasmtime package to version 36.0.19 or later.",
  "vendor": "rust",
  "product": "wasmtime",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 36.0.19"
      ],
      "ecosystem": "rust",
      "fixed_versions": [
        "36.0.19"
      ],
      "package_name": "wasmtime",
      "purl": "pkg:cargo/wasmtime"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 37.0.0, < 43.0.0"
      ],
      "ecosystem": "rust",
      "fixed_versions": [
        "43.0.0"
      ],
      "package_name": "wasmtime",
      "purl": "pkg:cargo/wasmtime"
    }
  ],
  "cwes": [
    197
  ],
  "cvss_score": 9.9,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 22.80130228333333,
  "t0_at": "2026-10-23T21:23:27.669000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-20T20:28:15.572233+00:00",
      "days": -3.038334453321759,
      "is_lower_bound": false,
      "measured_at": "2026-10-23T21:23:27.669000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-19T19:21:24+00:00",
      "days": -4.0847646875,
      "is_lower_bound": false,
      "measured_at": "2026-10-23T21:23:27.669000+00:00",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm"
    }
  }
}