{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55602", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T23:18:03.170Z", "datePublished": "2026-06-22T15:58:08.699Z", "dateUpdated": "2026-06-22T15:58:08.699Z"}, "containers": {"cna": {"title": "http-proxy-middleware `router` host+path substring matching allows Host-header-driven backend routing bypass", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-187", "lang": "en", "description": "CWE-187: Partial String Comparison", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj"}], "affected": [{"vendor": "chimurai", "product": "http-proxy-middleware", "versions": [{"version": ">= 4.0.0, < 4.1.0", "status": "affected"}, {"version": ">= 3.0.0, < 3.0.6", "status": "affected"}, {"version": ">= 0.16.0, < 2.0.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-22T15:58:08.699Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-64mm-vxmg-q3vj", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.1.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.16.0,2.0.10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "http-proxy-middleware", "source": "cna", "vendor": "chimurai"}, "product": "http-proxy-middleware", "vendor": "chimurai"}], "created": "2026-06-22T19:45:16.317874+00:00", "updated": "2026-06-22T20:45:04.768688+00:00", "vendors": ["chimurai", "chimurai$PRODUCT$http-proxy-middleware"]}