What is CVE-2026-21713?

CVE-2026-21713 is a medium-severity vulnerability in Nodejs Node, classified under CWE-208. CVSS score: 5.9/10. Published 2026-03-30.

How severe is CVE-2026-21713?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Nodejs Node

CVE-2026-21713

A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-r…

EPSS: 0.000 (1.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Nodejs Node — versions 20.20.1, 22.22.1, 24.14.0

Weakness classification (CWE)

CWE-208

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-21713?: CVE-2026-21713 is a medium-severity vulnerability in Nodejs Node, classified under CWE-208. CVSS score: 5.9/10. Published 2026-03-30.
How severe is CVE-2026-21713?: Medium severity. CVSS v3 base score is 5.9 out of 10.