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CVE-2026-14181 @fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths

🗓️ 01 Jul 2026 11:42:49Reported by openjsType 
cvelist
 cvelist
🔗 www.cve.org👁 6 Views

@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...

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Affected
Refs
ReporterTitlePublishedViews
Family
Circl
CVE-2026-14181
1 Jul 202611:47
circl
CVE
CVE-2026-14181
1 Jul 202611:42
cve
EUVD
EUVD-2026-40947
1 Jul 202611:42
euvd
NVD
CVE-2026-14181
1 Jul 202612:16
nvd
Vulnrichment
CVE-2026-14181 @fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths
1 Jul 202611:42
vulnrichment
[
  {
    "vendor": "@fastify/middie",
    "product": "@fastify/middie",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "9.1.0",
        "lessThan": "9.3.3"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "9.3.3"
      }
    ],
    "packageURL": "pkg:npm/@fastify/middie"
  }
]

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01 Jul 2026 11:42Current
CVSS 3.17.5
6