{"id":"CVE-2026-126408","summary":"Wasmtime 47.0.0 before 48.0.8 Denial of Service via TypedFunc Type-Check Panic","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.","aliases":["GHSA-3982-jqvv-277m","RUSTSEC-2026-0422"],"modified":"2026-11-14T10:30:48.135586844Z","published":"2026-11-13T09:35:42.943Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126408.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-617"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bytecodealliance/wasmtime","events":[{"introduced":"39d67168cdb6911ffdc961381314b6fed62e3c93"},{"fixed":"7b6c29ec3e9a49c97da231665cbd8eead9ccbda0"},{"introduced":"17830bd3c0331d920a8aa38846eebc4d46d98c23"},{"fixed":"805a0f15320e8836cf2b9f001b53d884bf866c89"},{"introduced":"ebe5e8df1f4e12c5fc2f5954926881d8d61367d8"},{"fixed":"c307ec81de02852d815e9849f7c89d955c03c30d"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","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"},{"range":[{"introduced":"50.0.0"},{"fixed":"50.0.1"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v50.0.0","v49.0.4","v49.0.3","v49.0.2","v49.0.1","v49.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126408.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","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"}]}