Vulnerability in H3 Srvx
CVE-2026-33732
srvx is a universal server based on web standards. Prior to version 0.11.13, a pathname parsing discrepancy in srvx's `FastURL` allows middleware bypass on the Node.js adapter when a raw HTTP request uses an absolute URI with a non-standard scheme (e.g. `file://`). Starting in version 0.11.13, the `FastURL` constructor now deopts to native `URL` for any string not starting with `/`, ensuring consistent pathname resolution.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/h3js/h3/security/advisories/GHSA-p36q-q72m-gchr (Mitigation, Vendor Advisory)
- github.com/h3js/srvx/commit/de0d69901c357f36a39b7e13eebef6c930652baa (Patch)
- github.com/h3js/srvx/releases/tag/v0.11.13 (Release Notes)
Frequently asked questions
- What is CVE-2026-33732?
- CVE-2026-33732 is a medium-severity vulnerability in H3 Srvx, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 4.8/10. Published 2026-03-26.
- How severe is CVE-2026-33732?
- Medium severity. CVSS v3 base score is 4.8 out of 10.