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CVE-2026-55602

8.6 · HIGH

http-proxy-middleware is node.js http-proxy middleware.

Published Jun 22, 2026CWE-20EPSS 0.38%

Overview

CVE-2026-55602 is a high-severity vulnerability. It was published on June 22, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vjGitHubgithub.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55602?

CVE-2026-55602 is a high-severity vulnerability. It was published on June 22, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-55602?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55602?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55602?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55602 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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