CVE-2026-119140

Medium

Description

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious components to panic the host via thread.yield in start functions. Attackers can supply a component whose start function calls an async-lowered import then thread.yield, causing an undisposed fiber drop that crashes embedders.

SeverityMedium

CVSS4.8

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-372CWE-372

How to fix

Update

bytecodealliance wasmtime48.0.6, 49.0.3 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5hhx-4wrr-3j9g

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

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