CVE-2026-115892 — Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type
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-typ…
Published: 2026-10-23 · CVSS: 5.7 · CVSS 4.0
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.
Source: CVE Program · Revision 579bdbb49eb1eb1fa5d95ade849eb65300d4cb26