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CVE-2026-55602

MEDIUM
6.9
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-55602
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-16 23:18 UTC
Published
2026-06-22 15:58 UTC
Last updated
2026-06-22 15:58 UTC
Primary CWE
CWE-20
CWE-20: Improper Input Validation
Vendor / Product
chimurai / http-proxy-middleware
Sources
cve.org  ·  NVD

Severity & Metrics

6.9 MEDIUM CVSS 4.0
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
Affected products (1)
VendorProductPlatformVersions
chimurai http-proxy-middleware — >= 4.0.0, < 4.1.0, >= 3.0.0, < 3.0.6, >= 0.16.0, < 2.0.10
Weakness (CWE)
CWESourceDescription
CWE-187 cna CWE-187: Partial String Comparison
CWE-20 cna CWE-20: Improper Input Validation
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.9 MEDIUM 4.0 cna 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
References (1)
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