CVE-2026-14570
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk40th percentile - higher than 40% 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 the potential full compromise of DSA private keys used for signing, allowing an attacker to impersonate trusted entities or forge signatures.
Recommendation
Immediately update the Crypt::DSA library to version 1.22 or later and generate new DSA key pairs, as existing keys should be considered compromised.
Other vulnerabilities in Crypt::DSA
See all- CVE-2026-8700High
Crypt::DSA versions before 1.20 for Perl generate seeds using the rand function, which is predictable and unsuitable for security usage.
- CVE-2026-12205Critical
Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery. The first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical 'r'.
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.