Description

http-proxy-middleware is node.js http-proxy middleware. From 0.16.0 until 2.0.10, 3.0.6, and 4.1.0, http-proxy-middleware documents router proxy-table entries as host, path, or host+path selectors, but the host+path implementation uses unanchored substring matching on attacker-controlled request metadata. As a result, a crafted Host header that is only a superstring match for a configured host+path key can still route a request to an unintended backend. This vulnerability is fixed in 2.0.10, 3.0.6, and 4.1.0.

Severity (CVSS)

Base score6.9
SeverityMedium
VersionCVSS 4.0
VectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Provided byCNA

Weaknesses

  • CWE-20 — CWE-20: Improper Input Validation
  • CWE-187 — CWE-187: Partial String Comparison

Affected products

VendorProductVersions
chimuraihttp-proxy-middleware>= 4.0.0, < 4.1.0; >= 3.0.0, < 3.0.6; >= 0.16.0, < 2.0.10

References

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 23 Jun 2026 10:05 UTC.