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

Summary 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 configur...

PT-2026-50734

Name of the Vulnerable Software and Affected Versions http-proxy-middleware versions 0.16.0 through 2.0.9 http-proxy-middleware versions 3.0.0 through 3.0.5 http-proxy-middleware versions 4.0.0 through 4.0.9 Description An issue exists in the router proxy-table implementation where host+path...

CVE-2026-55603

creationtimestamp| type| source ---|---|--- 2026-06-17 17:17:39+00:00| published-proof-of-concept| https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-gcq2-9pq2-cxqm 2026-06-23 09:03:07+00:00| seen| https://bsky.app/profile/hugovalters.bsky.social/post/3mox25jonrk2t...

CVE-2026-55602

creationtimestamp| type| source ---|---|--- 2026-06-17 17:17:28+00:00| published-proof-of-concept| https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj...

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