{"id":"CVE-2026-115892","revision":"1f7a75d80cd04457b327f78b0d322a20","records":[{"revision":"1f7a75d80cd04457b327f78b0d322a20","observedAt":"2026-10-23T22:48:20.692+00:00","statement":{"source":"cve-program","id":"CVE-2026-115892","aliases":[],"title":"Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type","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.","state":0,"publishedAt":"2026-10-23T21:26:54.528+00:00","modifiedAt":"2026-10-23T21:26:54.528+00:00","affected":[{"ecosystem":"Vendor product","name":"wasmtime","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"bytecodealliance\",\n                    \"product\": \"wasmtime\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 46.0.0, < 48.0.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 49.0.0, < 49.0.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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,"severity":"MEDIUM"}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5","https://github.com/bytecodealliance/wasmtime/pull/14819","https://github.com/bytecodealliance/wasmtime/pull/14820","https://github.com/bytecodealliance/wasmtime/pull/14827","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/releases/tag/v48.0.7","https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115892","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115892","identifiers":["CVE-2026-115892"]},"retained":false,"historicalAffected":[]}],"coverage":[]}