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CVE-2026-18504

🗓️ 18 Aug 2026 20:19:12Reported by openjsType 
cve
 cve
🔗 web.nvd.nist.gov👁 112 Views

Fastify before 5.12.1 bypasses schema validation on root primitives, letting uncoerced strings reach handlers.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
githubexploit
GithubExploit
Exploit for CVE-2026-16732
19 Aug 202600:14
–githubexploit
circl
Circl
CVE-2026-18504
18 Aug 202620:23
–circl
cvelist
Cvelist
CVE-2026-18504 fastify vulnerable to schema validation bypass via root primitive coercion mismatch
18 Aug 202620:19
–cvelist
euvd
EUVD
EUVD-2026-61221
2 Sep 202615:13
–euvd
github
Github Security Blog
fastify vulnerable to schema validation bypass via root primitive coercion mismatch
2 Sep 202615:13
–github
kitploit
Kitploit
CVE-2026-18504-CVE-2026-16732
13 Nov 202603:18
–kitploit
mend
Mend
CVE-2026-18504
18 Aug 202620:19
–mend
nvd
NVD
CVE-2026-18504
18 Aug 202621:16
–nvd
osv_cga
osv_cga
CGA-MFPW-HF63-JWC7
28 Oct 202616:41
–osv_cga
osv_cga
osv_cga
CGA-PR3F-JQRW-8G9C
20 Oct 202619:15
–osv_cga
Rows per page
NVD
Vulners
Node
fastifyfastifyRange<5.12.1node.js
[
  {
    "vendor": "fastify",
    "product": "fastify",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "0",
        "lessThan": "5.12.1"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "5.12.1"
      }
    ],
    "packageURL": "pkg:npm/fastify"
  }
]

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02 Sep 2026 14:30Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.3 - 5.4
EPSS0.0028
SSVC
112