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CVE-2026-55602

http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
chimurai / http-proxy-middlewareaffected >= 4.0.0, < 4.1.0; affected >= 3.0.0, < 3.0.6; affected >= 0.16.0, < 2.0.10

CWE

CWE-20, CWE-187

References

ADP enrichment

CISA-ADP

No English description supplied.