CVE-2026-14570
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk11th percentile — higher than 11% of all known CVEs
Summary
A vulnerability in the Crypt::DSA library for Perl before version 1.22 causes insecure generation of DSA signing nonces and private keys due to a biased random generator. An attacker with access to a few signatures and the public key can recover the private key using a lattice attack.
Risk Assessment
The risk is that an attacker can fully recover the DSA private key, compromising the confidentiality and integrity of all signatures created with the affected key.
Recommendation
Immediately update the Crypt::DSA library to version 1.22 or later, and consider all keys used with the vulnerable version as compromised, generating new key pairs.
Original NVD description (English source)
Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. "Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values." An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated.