CVE-2026-21713 in Node.js

摘要 (英语)

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**.

披露

2026-03-30

条目

VulDB provides additional information and datapoints for this CVE:

标识符	漏洞	CWE	可利用	对策	CVE
354146	Node.js HMAC Verification crypto_hmac.cc memcmp 权限提升	697	未定义	官方修复	CVE-2026-21713