What’s Vulnerable › Vulnerabilities

CVE-2026-33732: srvx is vulnerable to middleware bypass via absolute URI in request line

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-706

Description

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.

Affected products

• h3js srvx: before 0.11.13 — fixed in 0.11.13

How to fix

Upgrade to a fixed version: h3js srvx 0.11.13. Check the vendor advisory for mitigations.

References

• https://github.com/h3js/h3/security/advisories/GHSA-p36q-q72m-gchr
• https://github.com/h3js/srvx/commit/de0d69901c357f36a39b7e13eebef6c930652baa
• https://github.com/h3js/srvx/releases/tag/v0.11.13

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