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Vulnerability DatabaseCVE-2026-33806

CVE-2026-33806: 
JavaScript vulnerability analysis and mitigation

Impact:

Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.

This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442

Patches:

Upgrade to fastify v5.8.5 or later.

Workarounds:

None. Upgrade to the patched version.

Source: NVD

Related JavaScript vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-39884HIGH8.3
  • JavaScriptJavaScript
  • mcp-server-kubernetes
NoYesApr 15, 2026
GHSA-26wg-9xf2-q495HIGH8.1
  • JavaScriptJavaScript
  • novu/api
NoYesApr 14, 2026
CVE-2026-33806HIGH7.5
  • JavaScriptJavaScript
  • fastify
NoYesApr 15, 2026
GHSA-43fj-qp3h-hrh5MEDIUM6.9
  • JavaScriptJavaScript
  • @sync-in/server
NoYesApr 15, 2026
CVE-2026-40346MEDIUM6.4
  • JavaScriptJavaScript
  • @nocobase/plugin-workflow-request
NoYesApr 15, 2026

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