CVE-2026-55602
6.9
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| chimurai | http-proxy-middleware | >= 4.0.0, < 4.1.0 | affected |
| chimurai | http-proxy-middleware | >= 3.0.0, < 3.0.6 | affected |
| chimurai | http-proxy-middleware | >= 0.16.0, < 2.0.10 | affected |
Weaknesses
- CWE-20: CWE-20: Improper Input Validation
- CWE-187: CWE-187: Partial String Comparison
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
References
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