CVE-2026-119139

Medium

Description

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export through Func::call.

SeverityMedium

CVSS4.8

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-617CWE-617

How to fix

Update

bytecodealliance wasmtime48.0.6, 49.0.3 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m6w2-jwq2-cv2c

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	46.0.0 ≤ v < 48.0.6, 49.0.0 ≤ v < 49.0.3	48.0.6, 49.0.3

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.