CVE catalog

CVE-2026-27195

Wasmtime is a runtime for WebAssembly. Starting with Wasmtime 39.0.0, the `component-model-async` feature became the default, which brought with it a new implementation of `[Typed]Func::call_async` wh

[CVE catalog]

Severity: Medium · CVSS 6.9
Published: Feb 24, 2026, 9:15:20 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.41% · Oct 25, 2026

A flaw was found in Wasmtime. When a host embedding repeatedly calls an asynchronous function (`[Typed]Func::call_async`) exported by a WebAssembly (Wasm) component and drops the returned future before it completes, Wasmtime will encounter a panic. This issue can lead to a denial of service (DoS), making the Wasmtime runtime unavailable. wasmtime: Wasmtime: Denial of Service via repeated async function calls The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Rust	wasmtime	Not reported	`40.0.4`	fixed
Rust	wasmtime	Not reported	`41.0.4`	fixed
Cpe	wasmtime	Not reported	Not reported	unknown

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Rust	wasmtime	rust	Not reported	`40.0.4`	Not reported	Not reported	Not reported
Rust	wasmtime	rust	Not reported	`41.0.4`	Not reported	Not reported	Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed: Oct 27, 2026, 12:45:56 PM UTC

References

[FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]