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Web Crypto API and Math.random() Limitations Highlighted

First seen 2 Nov 2026, 16:14 UTC •
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ThreatCluster •November 2, 2026 at 19:47 UTC
  • •Math.random() is not secure for cryptographic use.
  • •Crypto.getRandomValues() is recommended for generating secure random values.
  • •Both APIs have been available since July 2015 without reported vulnerabilities.

Mozilla's documentation emphasizes that Math.random() is not suitable for cryptographic purposes and should not be used for security-related applications. Instead, it recommends the Web Crypto API's Crypto.getRandomValues() method, which provides cryptographically strong random values. Both features have been available since July 2015 and function across various devices and browsers. The Math.random() method generates pseudo-random numbers, while Crypto.getRandomValues() uses a pseudo-random number generator seeded with sufficient entropy. Developers are advised to use the latter for any security-related implementations. No new vulnerabilities or were reported in these articles.

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Common questions

What should I use for cryptographic random numbers?
Use the Crypto.getRandomValues() method instead of Math.random() for cryptographic purposes.
Are there any vulnerabilities reported for these APIs?
No vulnerabilities or active exploitation have been reported for Math.random() or Crypto.getRandomValues() in the articles.
Since when have these features been available?
Both Math.random() and Crypto.getRandomValues() have been available since July 2015.