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CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision

🗓️ 04 Sep 2026 09:40:18Reported by openjsType 
cvelist
 cvelist
🔗 www.cve.org👁 73 Views

Fastify <5.12.2 request body replaced by 'value' property via async validation collision.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-84504
4 Sep 202609:45
–circl
cve
CVE
CVE-2026-84504
4 Sep 202609:40
–cve
euvd
EUVD
EUVD-2026-70984
30 Sep 202623:45
–euvd
github
Github Security Blog
fastify vulnerable to request body replacement via an async validation result collision
30 Sep 202623:45
–github
mend
Mend
CVE-2026-84504
4 Sep 202609:40
–mend
nvd
NVD
CVE-2026-84504
4 Sep 202610:17
–nvd
osv_cga
osv_cga
CGA-9X5Q-GGQX-8G2Q
20 Oct 202620:20
–osv_cga
osv_cga
osv_cga
CGA-WHHV-433F-82XV
28 Oct 202616:41
–osv_cga
osv_cga
osv_cga
CGA-WMP8-PJ9Q-G78F
20 Oct 202619:15
–osv_cga
osv_clsa
osv_clsa
CLSA-2026-1790870980 TuxCare security update for fastify (2 CVEs)
1 Oct 202616:09
–osv_clsa
Rows per page
[
  {
    "vendor": "fastify",
    "product": "fastify",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "0",
        "lessThan": "5.12.2"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "5.12.2"
      }
    ],
    "packageURL": "pkg:npm/fastify"
  }
]

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