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CVE-2026-44351 - Vulnerability Analysis

CriticalCVSS: 9.1

Last Updated: May 14, 2026

fast-jwt - Authentication Bypass

Published: May 13, 2026Updated: May 14, 2026Remote Exploitable

Overview

fast-jwt < 6.2.4 contains an authentication bypass caused by async key-resolver returning empty string leading to acceptance of forged JWTs with empty-key HMAC, letting unauthenticated attackers forge arbitrary tokens.

Severity & Score

Severity: Critical

CVSS Score: 9.1

Impact

Unauthenticated attackers can forge arbitrary JWTs, bypassing authentication and gaining unauthorized access.

Mitigation

Upgrade to version 6.2.4 or later.

References

https://github.com/nearform/fast-jwt/security/advisories/GHSA-gmvf-9v4p-v8jc

Related Resources

Vulnerability Intelligence Dashboard
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Details

CVE ID: CVE-2026-44351
Severity: Critical
CVSS Score: 9.1
Type: broken_authentication
Status: rejected

CWE

CWE-287

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N