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ALPINE-CVE-2026-21713

ALPINE-CVE-2026-21713

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 5.9 · Medium · Fix available

Published
Updated

Stack: system

Affected products and versions

  • nodejs Alpine:v3.21

    Affected ranges
    • ECOSYSTEM: < 22.22.2-r0

    Update to 22.22.2-r0

  • nodejs Alpine:v3.22

    Affected ranges
    • ECOSYSTEM: < 22.22.2-r0

    Update to 22.22.2-r0

  • nodejs Alpine:v3.23

    Affected ranges
    • ECOSYSTEM: < 24.14.1-r0

    Update to 24.14.1-r0

  • nodejs Alpine:v3.24

    Affected ranges
    • ECOSYSTEM: < 24.14.1-r0

    Update to 24.14.1-r0

Original sources

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