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.

CVSS

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

23 Oct 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-23 22:16

Updated : 2026-10-29 15:17

NVD link : CVE-2026-115892

Mitre link : CVE-2026-115892

CVE.ORG link : CVE-2026-115892

JSON object : View

Products Affected

No product.

CWE

CWE-248

Uncaught Exception

CWE-843

Access of Resource Using Incompatible Type ('Type Confusion')

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