Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chimurai | Http-Proxy-Middleware | >= 0.16.0, < 2.0.10 |
Related Weaknesses (CWE)
References
- https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-ExploitVendor Advisory
- https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-ExploitVendor Advisory
FAQ
What is CVE-2026-55602?
CVE-2026-55602 is a vulnerability with a CVSS score of 8.6 (HIGH). 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, bu...
How severe is CVE-2026-55602?
CVE-2026-55602 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55602?
Check the references section above for vendor advisories and patch information. Affected products include: Chimurai Http-Proxy-Middleware.