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

Quick assessment

Affected
h3js srvx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

srvx是H3开源的一个基于Web标准的通用服务器。 srvx 0.11.13之前版本存在安全漏洞，该漏洞源于FastURL中存在路径名解析差异，可能导致中间件绕过。

CVSS 4.8 · Medium EPSS 0.25% · P16
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I. Basic Information for CVE-2026-33732

Vulnerability Information
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Vulnerability Title
srvx is vulnerable to middleware bypass via absolute URI in request line
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
srvx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
srvx是H3开源的一个基于Web标准的通用服务器。 srvx 0.11.13之前版本存在安全漏洞，该漏洞源于FastURL中存在路径名解析差异，可能导致中间件绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
h3js srvx < 0.11.13 -

II. Public POCs for CVE-2026-33732

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III. Intelligence Information for CVE-2026-33732

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Patches & Fixes for CVE-2026-33732 (1)

Vendor Advisories for CVE-2026-33732 (1)

Proof of Concept for CVE-2026-33732 (1)

IV. Related Vulnerabilities

Same vendor: h3js
Same weakness: CWE-706

V. Comments for CVE-2026-33732

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