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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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c592179be33af954c83856fcb08e5d5d3bc3f086396d1db4484e8e449f18131d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-187","description":"CWE-187: Partial String Comparison","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"http-proxy-middleware","vendor":"chimurai","versions":[{"status":"affected","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"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-187","description":"CWE-187: Partial String Comparison","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4e81586a6a3120633388ad6a2ea29f8bdf89b95a387d87f30121e3753a0f5493 · sha256:26ce84940689487c… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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