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**.
INFO
Published Date :
2026-03-30T19:07:28.356Z
Last Modified :
2026-03-30T19:45:22.905Z
Source :
hackerone
AFFECTED PRODUCTS
The following products are affected by CVE-2026-21713 vulnerability.
| Vendors | Products |
|---|---|
| Nodejs |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21713.
