CVE-2026-115892

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.

• CWE-248
• CWE-843

• 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
• https://github.com/bytecodealliance/wasmtime/pull/14827
• https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7
• https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4
• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5

Published

Oct 23, 2026

Last Modified

Oct 23, 2026

Status

Deferred

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