CVE-2026-119130

Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 HTTP Request Target Smuggling

State: Published
Severity: 2.1 Low
Published: Oct 29, 2026
Updated: Oct 29, 2026
Reserved: Oct 29, 2026

Description

Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 does not verify that set-path-with-query values in wasmtime-wasi-http are paths, so absolute-form URLs are written verbatim as the HTTP/1.1 request target while the connection uses the allowed authority. A malicious guest can supply an absolute URL that a forward proxy or gateway at that authority honors, reaching hosts disallowed by embedder filtering policies.

Scores

CVSS	Score	Vector	Source
4.0	2.1 Low	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	2.6 Low	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N	VulnCheck

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
wasmtimebytecodealliance	before 36.0.18Affected 36.0.18Not affected 37.0.0 to before 48.0.6Affected 48.0.6Not affected 49.0.0 to before 49.0.3Affected 49.0.3Not affected

References

GitHub Security Advisory (GHSA-5qpp-g3j2-8frx)vendor-advisory
VulnCheck Advisory: Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 HTTP Request Target Smugglingthird-party-advisory

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