Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M

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

Medium 4.8

In plain English

A medium-severity security flaw in srvx from h3js. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.3%top 82.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	srvx	0.11.13	GHSA-p36q-q72m-gchr

Affected products (as reported)

Vendor	Product	Versions
h3js	srvx	< 0.11.13

Weakness: CWE-706 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

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