CVE-2026-21713

A flaw was found in Node.js. The HMAC (Hash-based Message Authentication Code) verification process uses a comparison method that does not take a constant amount of time. This non-constant-time comparison can leak timing information, which, under specific conditions where precise timing measurements are possible, could be exploited by a remote attacker. This allows the attacker to infer sensitive HMAC values, leading to information disclosure.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.