{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"wasmtime","product":"wasmtime","source":"CNA: VulnCheck","vendor":"bytecodealliance","versions":[{"lessThan":"48.0.6","status":"affected","version":"46.0.0","versionType":"semver"},{"status":"unaffected","version":"48.0.6","versionType":"semver"},{"lessThan":"49.0.3","status":"affected","version":"49.0.0","versionType":"semver"},{"status":"unaffected","version":"49.0.3","versionType":"semver"}]}],"cveId":"CVE-2026-119135","cwes":["CWE-617"],"description":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 panics when the host reads a component model stream as a different Rust item type than it was created with, because the host-to-host read path asserts matching TypeIds instead of returning an error. Guest code can return a host-created StreamReader<U> that the embedder reads as StreamReader<T>, where both types map to the same component model type, crashing the embedding process.","epss":{"date":"2026-11-03","percentile":0.10973,"score":0.00208},"exploits":[],"kev":null,"metrics":[{"score":5.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":4.8,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793755686668,"publishedAt":1793289495914,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-streamreader-type-mismatch"}],"remediation":[],"revision":"a0ecc89af812d44e07f5e9206fd554329e602bb979fd264a766496b93b100e80","sources":[{"modifiedAt":1793755686668,"name":"CNA: VulnCheck","retrievedAt":1793758135608,"url":"https://www.cve.org/CVERecord?id=CVE-2026-119135"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793758140864,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-119135"}],"ssvc":{"assessedAt":1793755669472,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via StreamReader Type Mismatch","updatedAt":1793758140864}