CVE-2026-119140

CVSS 5.9 (medium) · published 2026-10-29

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.

Weakness: CWE-372

Source: NVD CVE-2026-119140

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5hhx-4wrr-3j9g
• https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-host-panic-via-thread-yield

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.