CVE-2026-115384

{
  "etk_id": "ETK-2026-2510",
  "cve_id": "CVE-2026-115384",
  "display_id": "CVE-2026-115384",
  "ghsa_id": "GHSA-6fff-wrjr-wjxr",
  "euvd_id": "EUVD-2026-108311",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Stack buffer overflow in Wasmtime async callback handling",
  "summary": "Wasmtime releases from 39.0.0 through 48.0.3, and 49.0.0 through 49.0.1, are affected when using component-model asynchronous callbacks. A malicious guest component can trigger native stack corruption, potentially terminating the host process or breaking guest isolation. Exploitation requires the host to process an attacker-controlled component with incompatible async callback result types.",
  "mitigation": "Upgrade to Wasmtime 48.0.4 or 49.0.2, as appropriate for your release line. Until upgraded, do not run untrusted components that use component-model asynchronous callbacks.",
  "vendor": "bytecodealliance",
  "product": "wasmtime",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 39.0.0, < 48.0.4",
        ">= 49.0.0, < 49.0.2"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "48.0.4",
        "49.0.2"
      ],
      "package_name": "wasmtime",
      "purl": null
    }
  ],
  "cwes": null,
  "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": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 40.54051255,
  "t0_at": "2026-10-22T19:13:51.422000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-22T19:13:51.422000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T19:13:51.422000+00:00",
      "url": "https://github.com/advisories/GHSA-6fff-wrjr-wjxr"
    }
  }
}