CVE-2026-55602: http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass
chimurai · http-proxy-middleware
Affected: chimurai http-proxy-middleware · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 32% of scored CVEs
DescriptionCVE.org
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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- chimurai · http-proxy-middleware>= 4.0.0, < 4.1.0; >= 3.0.0, < 3.0.6; >= 0.16.0, < 2.0.10
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-55602 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.