[NVD] CVE-2026-21713 (MEDIUM 5.9) — 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 possibl

CVE-2026-21713 CVSS: 5.9 MEDIUM Published: 2026-03-30T20:16:19.397

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 orac