CVE-2026-55602

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.6
EG Score
8.6(medium)
EPSS
26.0%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

`router` host+path substring matching allows Host-header-driven backend routing bypass · Advisory · chimurai/http-proxy-middleware · GitHub

https://github.com/chimurai/http-proxy-middleware/security/advisories/GHSA-64mm-vxmg-q3vj

Vendor Advisories for CVE-2026-55602(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
http-proxy-middleware—2.0.10—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 23:22 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 11:45 UTCEG score recompute
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 23:29 UTCEG score recompute
  8. 2026-07-05 11:53 UTCEG score recompute
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-05 00:15 UTCEG score recompute
  12. 2026-07-04 12:34 UTCEG score recompute
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 00:58 UTCEG score recompute
  16. 2026-07-03 13:22 UTCEG score recompute
  17. 2026-07-03 01:45 UTCEG score recompute
  18. 2026-07-02 14:07 UTCEG score recompute
  19. 2026-07-02 02:29 UTCEG score recompute
  20. 2026-07-01 15:07 UTCEPSS rescore
  21. 2026-07-01 14:53 UTCEG score recompute
  22. 2026-07-01 03:17 UTCEG score recompute
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 15:41 UTCEG score recompute
  25. 2026-06-30 04:04 UTCEG score recompute
Show 23 more
  1. 2026-06-29 16:26 UTCEG score recompute
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 04:48 UTCEG score recompute
  5. 2026-06-28 17:11 UTCEG score recompute
  6. 2026-06-28 14:07 UTCEPSS rescore
  7. 2026-06-28 05:33 UTCEG score recompute
  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-27 17:56 UTCEG score recompute▲ 1.70
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 21:42 UTCNVD updateCVSS v3 → 8.6 · severity → HIGH
  13. 2026-06-26 18:26 UTCEG score recompute
  14. 2026-06-25 18:57 UTCEG score recompute
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-24 19:28 UTCEG score recompute
  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-23 19:11 UTCEG score recompute
  21. 2026-06-22 19:41 UTCEG score recompute▲ 6.90
  22. 2026-06-22 19:40 UTCNVD updateCVSS v3 → 6.9 · CVSS v4 → 6.9
  23. 2026-06-18 13:46 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55602?
CVE-2026-55602 is a high vulnerability published on June 18, 2026. 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…
When was CVE-2026-55602 disclosed?
CVE-2026-55602 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55602 actively exploited?
CVE-2026-55602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55602?
CVE-2026-55602 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-55602?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55602, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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