CVE-2026-115892

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-843 CWE-248
Vendor	bytecodealliance
Product	wasmtime
Published	Oct 23, 2026

Stay Ahead of the Next One

Get instant alerts for bytecodealliance wasmtime

Be the first to know when new unknown vulnerabilities affecting bytecodealliance wasmtime are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

bytecodealliance / wasmtime

>= 46.0.0, < 48.0.7 >= 49.0.0, < 49.0.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗