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CVE-2026-34950

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CVE-2026-34950

Published: Apr 6, 2026

Modified: Apr 6, 2026

PUBLISHED

CVSS v3.1

9.1

CRITICAL

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact same JWT algorithm confusion attack that CVE-2023-48223 patched.

VendorProductVersions

nearform

fast-jwt

affected
<= 6.1.0

Weaknesses (CWE)

CWE-327

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

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