CVE-2026-119131

CVSS 6.9 (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 in wasmtime-wasi-http that lets guests crash the host by sending long request URLs. Guests can use set-path-with-query with a '?' after byte 65535, overflowing a u16 index in the http crate and triggering a host panic.

Weakness: CWE-190

Source: NVD CVE-2026-119131

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w36r-2hch-9xp9
• https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-host-panic-via-wasi-http

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