CVE-2026-21713 - Node.js HMAC Timing Oracle Vulnerability

CVE-2026-21713 - Node.js HMAC Timing Oracle Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Tue, 03/31/2026 - 00:09
CVE ID :CVE-2026-21713
Published : March 30, 2026, 8:16 p.m. | 49 minutes ago
Description :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**.
Severity: 5.9 | MEDIUM
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