# @clerk/fastify (npm) vulnerabilities

3 known vulnerabilities (3 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Weekly downloads: 213.7K
- Dependents: 4
- Registry: https://www.npmjs.com/package/@clerk/fastify

## Advisories (3)

### [CVE-2026-42349](https://cve.now/CVE-2026-42349): Clerk: Authorization bypass when combining organization, billing, or reverification checks

- Severity: High 7.6
- Published: May 11, 2026
- Affected: from 1.0.42, fixed in 2.6.31; from 3.0.0, fixed in 3.1.16.

### [CVE-2026-34076](https://cve.now/CVE-2026-34076): Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

- Severity: High 7.4
- Published: Apr 1, 2026
- Affected: from 3.1.0, fixed in 3.1.5.

### [CVE-2025-53548](https://cve.now/CVE-2025-53548): @clerk/backend Performs Insufficient Verification of Data Authenticity

- Severity: High 7.5
- Published: Jul 9, 2025
- Affected: from 2.3.0, fixed in 2.4.4.

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/packages/npm/@clerk/fastify
Site guide for agents: https://cve.now/llms.txt
Uses NVD data; not endorsed by NVD.