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CVE-2026-115892— Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type

Quick assessment

Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wasmtime 是一个 WebAssembly 运行时。在版本 46.0.0 至 48.0.7 以及 49.0.4 之间，当将主机（host）创建的组件模型流（stream）或未来对象（future）降级（lower）到客户机（guest）时，若该值经过客户机代码处理并通过 、 、 、 或等效的类型化读取器返回，可能会遗漏必要的负载类型（payload-type）检查。恶意客户机若能控制导出函数的类型或返回值，便可诱使主机将类型擦除后的值传递给期望不同负载类型的客户机，从而导致 Wasmtime 主机发生 pan

CVSS 5.7 · Medium
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I. Basic Information for CVE-2026-115892

Vulnerability Information
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Vulnerability Title
Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bytecodealliance wasmtime >= 46.0.0, < 48.0.7 -

II. Public POCs for CVE-2026-115892

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III. Intelligence Information for CVE-2026-115892

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Patches & Fixes for CVE-2026-115892 (4)

Vendor Advisories for CVE-2026-115892 (1)

Vendor Pages for CVE-2026-115892 (2)

Same Patch Batch · bytecodealliance · 2026-10-23 · 3 CVEs total

CVE-2026-115893 9.9 CRITICAL Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_tabl
CVE-2026-115889 9.9 CRITICAL Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-843

V. Comments for CVE-2026-115892

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