{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "47.0.0"
                  },
                  {
                    "fixed": "48.0.8"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "introduced": "49.0.0"
                  },
                  {
                    "fixed": "49.0.5"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "introduced": "50.0.0"
                  },
                  {
                    "fixed": "50.0.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          "events": [
            {
              "introduced": "39d67168cdb6911ffdc961381314b6fed62e3c93"
            },
            {
              "fixed": "7b6c29ec3e9a49c97da231665cbd8eead9ccbda0"
            },
            {
              "introduced": "17830bd3c0331d920a8aa38846eebc4d46d98c23"
            },
            {
              "fixed": "805a0f15320e8836cf2b9f001b53d884bf866c89"
            },
            {
              "introduced": "ebe5e8df1f4e12c5fc2f5954926881d8d61367d8"
            },
            {
              "fixed": "c307ec81de02852d815e9849f7c89d955c03c30d"
            }
          ],
          "repo": "https://github.com/bytecodealliance/wasmtime",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3982-jqvv-277m"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-617"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126408.json"
  },
  "details": "Wasmtime 47.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 contains an insufficient type-check in the TypedFunc embedder API for I31, Option\u003cI31\u003e, and Option\u003cNoneRef\u003e parameter or result types, reaching an unreachable!() path. A malicious guest module exporting a function that uses another anyref-hierarchy type can panic the host embedding, causing denial of service.",
  "id": "CVE-2026-126408",
  "modified": "2026-11-14T10:30:48.135586844Z",
  "published": "2026-11-13T09:35:42.943Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126408.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126408"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.8-denial-of-service-via-typedfunc-type-check-panic"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Wasmtime 47.0.0 before 48.0.8 Denial of Service via TypedFunc Type-Check Panic"
}