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Security Advisories

CVE-2026-21713

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-21713

Severity

5.9

Medium

CVSS V3

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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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-21713
  • https://github.com/advisories/GHSA-6r7g-3mm3-fhw7
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21713.json
  • https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

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