CVE-2026-14181

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 79% 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, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to throw synchronously, and the exception escapes the middie normalize step and terminates the Node.js process. The bypass affects applications that call middie.run directly on the standalone engine API, causing an immediate denial of service for all connected clients until restart. Applications using the Fastify plugin path are not affected because Fastifys error handler catches the exception. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: migrate from the standalone engine API to the Fastify plugin path, where the framework error handler catches the exception.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
20.9%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
Patch available. Sources: github.
github Patch Available

@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths · Advisory · fastify/middie · GitHub

https://github.com/fastify/middie/security/advisories/GHSA-qcc9-jh8q-47vh
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 35× 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. 2026-07-12 02:26 UTCEG score recompute
  2. 2026-07-11 15:27 UTCEG score recompute
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 04:29 UTCEG score recompute
  5. 2026-07-10 17:31 UTCEG score recompute
  6. 2026-07-10 06:33 UTCEG score recompute
  7. 2026-07-09 19:34 UTCEG score recompute
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 08:37 UTCEG score recompute
  10. 2026-07-08 21:34 UTCEG score recompute
  11. 2026-07-08 15:15 UTCEPSS rescore
  12. 2026-07-08 15:15 UTCEPSS rescore
  13. 2026-07-08 10:37 UTCEG score recompute
  14. 2026-07-07 23:37 UTCEG score recompute
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-07 12:39 UTCEG score recompute
  17. 2026-07-07 01:40 UTCEG score recompute
  18. 2026-07-06 16:27 UTCEPSS rescore
  19. 2026-07-06 14:42 UTCEG score recompute
  20. 2026-07-06 03:42 UTCEG score recompute
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 16:45 UTCEG score recompute
  23. 2026-07-05 05:45 UTCEG score recompute
  24. 2026-07-05 02:30 UTCEPSS rescore
  25. 2026-07-05 02:30 UTCEPSS rescore
Show 10 more
  1. 2026-07-04 18:44 UTCEG score recompute
  2. 2026-07-04 07:45 UTCEG score recompute
  3. 2026-07-04 06:31 UTCEPSS rescore
  4. 2026-07-03 20:42 UTCEG score recompute
  5. 2026-07-03 09:44 UTCEG score recompute
  6. 2026-07-02 22:46 UTCEG score recompute
  7. 2026-07-02 11:48 UTCEG score recompute
  8. 2026-07-02 00:50 UTCEG score recompute
  9. 2026-07-01 13:53 UTCEG score recompute
  10. 2026-07-01 13:52 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-14181?
CVE-2026-14181 is a high vulnerability published on July 1, 2026. @fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to…
When was CVE-2026-14181 disclosed?
CVE-2026-14181 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14181 actively exploited?
CVE-2026-14181 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-14181?
CVE-2026-14181 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-14181?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14181, 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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