Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937
- https://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17
- https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17
- 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-
FAQ
What is CVE-2026-115892?
CVE-2026-115892 is a documented vulnerability. 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...
How severe is CVE-2026-115892?
CVSS scoring is not yet available for CVE-2026-115892. Check NVD for updates.
Is there a patch for CVE-2026-115892?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.