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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2026-55602] Unintended backend routing due to crafted Host header

This medium-severity Red Hat Linux advisory covers CVE-2026-55602.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-55602 Source published Source updated

VulniPulse record published Record updated

CVE-2026-55602
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

http-proxy-middleware is node.js http-proxy middleware. 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. Unanchored substring matching on the attacker-controlled Host header can match a configured host+path key without an exact host match, sending the request to the wrong backend.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-346.

Is CVE-2026-55602 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-55602 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-55602?

Upgrade to a fixed release named by Red Hat:

  • 2.0.10
  • 3.0.6
  • 4.1.0

Confirm against the vendor advisory before you patch.

Affected versions
  • < 2.0.10
  • < 3.0.6
  • < 4.1.0

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • 2.0.10
  • 3.0.6
  • 4.1.0

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation

Upgrade to a fixed release: 2.0.10, 3.0.6, 4.1.0. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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