Improper input validation in Bytecodealliance Wasmtime
CVE-2026-119130
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5qpp-g3j2-8frx (vendor-advisory)
- www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-4… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119130?
- CVE-2026-119130 is a low-severity vulnerability in Bytecodealliance Wasmtime, classified under Improper Input Validation. CVSS score: 2.6/10. Published 2026-10-29.
- How severe is CVE-2026-119130?
- Low severity. CVSS v3 base score is 2.6 out of 10.