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CVE-2026-71851 is a cryptographic weakness in the crypto-js JavaScript library affecting versions prior to 4.0.0. The flaw is in CryptoJS.lib.WordArray.random(), which used a custom variation of a Multiply-With-Carry pseudorandom number generator seeded from Math.random() rather than a cryptographically secure entropy source. Introduced in version 3.1.2-4 and present in nearly all 3.x releases, this design causes outputs requested as 128-bit or 256-bit random values to have drastically reduced effective entropy, with practical search spaces of roughly 2^39 and 2^47 respectively. Any downstream application that relied on this function to generate security-sensitive material such as cryptographic keys, initialization vectors, tokens, or BIP39 wallet recovery phrase entropy may have produced secrets that are reconstructable by brute-force enumeration.
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A cryptographic weakness in crypto-js before 4.0.0 where CryptoJS.lib.WordArray.random() uses a weak PRNG seeded from Math.random(), resulting in insufficient entropy and enabling enumeration of generated wallet seed material and recovery of private keys.
A critical weak cryptographic randomness vulnerability in crypto-js versions prior to 4.0.0, where CryptoJS.lib.WordArray.random() uses a custom Multiply-With-Carry PRNG seeded with Math.random(), resulting in insufficient entropy for generated cryptographic secrets such as keys, IVs, and mnemonic seed phrases.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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