Biased DSA nonce generation in jsrsasign
CVE-2026-4599 affects jsrsasign versions 7.0.0 through before 11.1.1. The vulnerability is caused by incorrect compareTo validation in the getRandomBigIntegerZeroToMax and getRandomBigIntegerMinToMax functions in src/crypto-1.1.js. Due to incomplete comparison logic, these functions can accept out-of-range random candidates, which biases the nonce values used during DSA signature generation. Because DSA security depends on uniformly random per-signature nonces, this bias can be exploited to recover the DSA private key.
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