CVE-2026-119140

MediumCVSS 4.8/10Last modified Nov 3, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-372

Affected software

Vendor	Product	Versions
bytecodealliance	wasmtime	>= 46.0.0, < 48.0.6; >= 49.0.0, < 49.0.3

References

Timeline

Published: Oct 29, 2026
Last modified: Nov 3, 2026
NVD status: Deferred

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