{"cve":"CVE-2026-115892","nvd":{"published":"2026-10-23T22:16:58.633","modified":"2026-10-23T22:16:58.777","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":5.7},"cvss_v3":null,"cwes":["CWE-248","CWE-843"],"references":["https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd","https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158","https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618","https://github.com/bytecodealliance/wasmtime/pull/14819","https://github.com/bytecodealliance/wasmtime/pull/14820"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-115892","score":0.00434,"percentile":0.37373,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9pvw-hwfg-92h5","url":"https://osv.dev/vulnerability/GHSA-9pvw-hwfg-92h5","summary":"Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type","modified":"2026-10-23T22:25:32.526713550Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=46.0.0 <48.0.7"],"fixed":["48.0.7"]},{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=49.0.0 <49.0.4"],"fixed":["49.0.4"]}]},{"id":"RUSTSEC-2026-0378","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0378","summary":"Panic lowering a host-created component model stream into a guest that expects a different payload type","modified":"2026-10-24T06:25:41Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=46.0.0 <48.0.7",">=49.0.0 <49.0.4"],"fixed":["48.0.7","49.0.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}