CVE-2026-21713
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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**.
| Vendor | nodejs |
| Product | node |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 30, 2026 |
| Last Updated | Mar 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Affected Versions
nodejs / node
20.20.1 ≤ 20.20.1 22.22.1 ≤ 22.22.1 24.14.0 ≤ 24.14.0 25.8.1 ≤ 25.8.1 4.0 < 4.* 5.0 < 5.* 6.0 < 6.* 7.0 < 7.* 8.0 < 8.* 9.0 < 9.* 10.0 < 10.* 11.0 < 11.* 12.0 < 12.* 13.0 < 13.* 14.0 < 14.* 15.0 < 15.* 16.0 < 16.* 17.0 < 17.* 18.0 < 18.* 19.0 < 19.*