CVE-2026-21713 Affecting nodejs package, versions <22.22.2-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-ALPINE321-NODEJS-15954319
  • published9 Apr 2026
  • disclosed30 Mar 2026

Introduced: 30 Mar 2026

NewCVE-2026-21713  (opens in a new tab)

How to fix?

Upgrade Alpine:3.21 nodejs to version 22.22.2-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nodejs package and not the nodejs package as distributed by Alpine. See How to fix? for Alpine:3.21 relevant fixed versions and status.

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-resolution timing measurements are possible, this behavior could be exploited as a timing oracle to infer HMAC values.

Node.js already provides timing-safe comparison primitives used elsewhere in the codebase, indicating this is an oversight rather than an intentional design decision.

This vulnerability affects 20.x, 22.x, 24.x, and 25.x.

CVSS Base Scores

version 3.1