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CVE-2026-34950

nvd nist
Published: Apr 6, 2026Modified: Jun 17, 2026

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9.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploitability: 3.9 / Impact: 5.2
Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Nearform: Fast Jwt
Nearform
1 product
Fast Jwt
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Fast Jwt
Before 6.2.0

Related CWEs

CWE-327
Use of a Broken or Risky Cryptographic Algorithm
The product uses a broken or risky cryptographic algorithm or protocol.

References (1)

Source: security-advisories@github.com
ExploitVendor Advisory

Timeline

No history available yet.