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CVE-2026-6556

🗓️ 30 Jun 2026 12:48:41Reported by openjsType 
cve
 cve
🔗 web.nvd.nist.gov👁 68 Views

Vulnerability in fastify express up to 4.0.6 allows middleware bypass for non-string mount paths in prefixed plugins; upgrade to 4.0.7.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-6556
30 Jun 202612:48
–attackerkb
circl
Circl
CVE-2026-6556
30 Jun 202612:54
–circl
cvelist
Cvelist
CVE-2026-6556 @fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
30 Jun 202612:48
–cvelist
euvd
EUVD
EUVD-2026-40309
30 Jun 202612:48
–euvd
mend
Mend
CVE-2026-6556
30 Jun 202612:48
–mend
nvd
NVD
CVE-2026-6556
30 Jun 202613:19
–nvd
osv_cve
osv_cve
CVE-2026-6556 @fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
30 Jun 202612:48
–osv_cve
ptsecurity
Positive Technologies
PT-2026-53878
30 Jun 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-6556: Improper Authorization
30 Jun 202600:00
–rapid7
snyk
Snyk
Incorrect Behavior Order
30 Jun 202615:27
–snyk
Rows per page
NVD
Vulners
Node
fastifyfastify/expressRange<4.0.7node.js
[
  {
    "vendor": "@fastify/express",
    "product": "@fastify/express",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "0",
        "lessThan": "4.0.7"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "4.0.7"
      }
    ],
    "packageURL": "pkg:npm/@fastify/express"
  }
]

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01 Jul 2026 15:57Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.1
EPSS0.00522
SSVC
68