CVE-2026-55602
http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass
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.
INFO
Published Date :
June 22, 2026, 3:58 p.m.
Last Modified :
June 22, 2026, 3:58 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update http-proxy-middleware to version 2.0.10 or later.
- Update http-proxy-middleware to version 3.0.6 or later.
- Update http-proxy-middleware to version 4.1.0 or later.
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