CVE-2015-10004: JSON Web Token Project JSON Web Token

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.

Affected products

Published 2022-12-27. Last modified 2026-06-17.