{"id":"CVE-2026-115892","summary":"Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type","details":"Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.","aliases":["GHSA-9pvw-hwfg-92h5","RUSTSEC-2026-0378"],"modified":"2026-10-25T02:46:00.893320552Z","published":"2026-10-23T21:26:54.528Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-248","CWE-843"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115892.json"},"references":[{"type":"WEB","url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7"},{"type":"WEB","url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115892.json"},{"type":"ADVISORY","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115892"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/pull/14819"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/pull/14820"},{"type":"FIX","url":"https://github.com/bytecodealliance/wasmtime/pull/14827"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bytecodealliance/wasmtime","events":[{"introduced":"423be7a4e4d30bb377c836d317521d1eb874e157"},{"fixed":"c6846e13f64b07b7912d372db141397058b55f99"},{"introduced":"17830bd3c0331d920a8aa38846eebc4d46d98c23"},{"fixed":"2c2970205fe05d6bbf15b9bff6f1e67874b2db5c"},{"fixed":"222ff3a65dab9aa7011f8c246937751a0bac5abd"},{"fixed":"48dacc76241f06088e79f3ce1b17642f2f7bf158"},{"fixed":"994549891c8a706cb4f2809f9d17b9f67b31e618"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"46.0.0"},{"fixed":"48.0.7"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"strategy":"StringRangeExpression","range":[{"introduced":"49.0.0"},{"fixed":"49.0.4"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"222ff3a65dab9aa7011f8c246937751a0bac5abd"}]},{"range":[{"fixed":"48dacc76241f06088e79f3ce1b17642f2f7bf158"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"994549891c8a706cb4f2809f9d17b9f67b31e618"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_TAG","original_tag":"v48.0.7","range":[{"fixed":"c6846e13f64b07b7912d372db141397058b55f99"}]},{"source":"REFERENCES_TAG","original_tag":"v49.0.4","range":[{"fixed":"2c2970205fe05d6bbf15b9bff6f1e67874b2db5c"}]}]}}],"versions":["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-2026-115892.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}