Vulnerability Details CVE-2026-55602
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 25.9%
CVSS Severity
CVSS v3 Score 8.6
References
Products affected by CVE-2026-55602
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cpe:2.3:a:chimurai:http-proxy-middleware:0.16.0
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cpe:2.3:a:chimurai:http-proxy-middleware:0.17.0
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cpe:2.3:a:chimurai:http-proxy-middleware:0.17.1
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cpe:2.3:a:chimurai:http-proxy-middleware:0.17.2
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cpe:2.3:a:chimurai:http-proxy-middleware:0.17.3
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cpe:2.3:a:chimurai:http-proxy-middleware:0.17.4
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cpe:2.3:a:chimurai:http-proxy-middleware:0.18.0
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cpe:2.3:a:chimurai:http-proxy-middleware:0.19.0
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cpe:2.3:a:chimurai:http-proxy-middleware:0.19.1
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cpe:2.3:a:chimurai:http-proxy-middleware:0.19.2
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cpe:2.3:a:chimurai:http-proxy-middleware:0.20.0
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cpe:2.3:a:chimurai:http-proxy-middleware:0.21.0
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.0
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.1
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.2
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.3
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.4
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.5
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cpe:2.3:a:chimurai:http-proxy-middleware:1.0.6
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cpe:2.3:a:chimurai:http-proxy-middleware:1.1.0
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cpe:2.3:a:chimurai:http-proxy-middleware:1.1.1
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cpe:2.3:a:chimurai:http-proxy-middleware:1.1.2
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cpe:2.3:a:chimurai:http-proxy-middleware:1.2.0
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cpe:2.3:a:chimurai:http-proxy-middleware:1.2.1
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cpe:2.3:a:chimurai:http-proxy-middleware:1.3.0
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cpe:2.3:a:chimurai:http-proxy-middleware:1.3.1
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.0
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.1
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.2
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.3
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.4
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.5
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.6
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.7
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.8
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cpe:2.3:a:chimurai:http-proxy-middleware:2.0.9
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.0
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.1
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.2
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.3
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.4
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cpe:2.3:a:chimurai:http-proxy-middleware:3.0.5
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cpe:2.3:a:chimurai:http-proxy-middleware:4.0.0