{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"48.0.8","status":"affected","version":"47.0.0","versionType":"semver"},{"status":"unaffected","version":"48.0.8","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"49.0.5","status":"affected","version":"49.0.0","versionType":"semver"},{"status":"unaffected","version":"49.0.5","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"50.0.1","status":"affected","version":"50.0.0","versionType":"semver"},{"status":"unaffected","version":"50.0.1","versionType":"semver"}]}],"cveId":"CVE-2026-126408","cwes":["CWE-617"],"description":"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<I31>, and Option<NoneRef> 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.","epss":{"date":"2026-11-13","percentile":0.07438,"score":0.00178},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m"}],"kev":null,"metrics":[{"score":1,"severity":"low","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":1.8,"severity":"low","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},{"score":1,"severity":"low","source":"NVD: disclosure@vulncheck.com","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":1.8,"severity":"low","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L","version":"3.1"}],"modifiedAt":1794601512084,"publishedAt":1794562542943,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.8-denial-of-service-via-typedfunc-type-check-panic"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.8-denial-of-service-via-typedfunc-type-check-panic"}],"remediation":[],"revision":"41fa1613bdbef608b2a804970a7f0041397c5946a9e448fc055aeed7a3b8bb19","sources":[{"modifiedAt":1794601512084,"name":"CNA: VulnCheck","retrievedAt":1794604184697,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126408"},{"modifiedAt":1794565065963,"name":"NVD","retrievedAt":1794572197564,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126408"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794604187641,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126408"}],"ssvc":{"assessedAt":1794601469977,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Wasmtime 47.0.0 before 48.0.8 Denial of Service via TypedFunc Type-Check Panic","updatedAt":1794604187641}