CVE-2026-14570
Description
A flaw was found in Crypt::DSA. Versions before 1.22 for Perl use a biased random number generator when creating the Digital Signature Algorithm (DSA) signing nonce and private key. This bias allows a remote attacker to recover the private key through a lattice attack if they collect a sufficient number of signatures and have access to the public key. This vulnerability compromises the confidentiality of the private key.
Statement
A flaw was found in the Perl Crypt::DSA module. The random number generator used for DSA signing nonces and private key generation has a bias (the high bit is always set), allowing an attacker who collects a modest number of signatures to recover the private key via a lattice attack. Red Hat does not ship perl-Crypt-DSA in any supported product. This issue only affects the perl-Crypt-DSA package available in Fedora and EPEL community repositories.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
If a PRNG is used for authentication and authorization, such as a session ID or a seed for generating a cryptographic key, then an attacker may be able to easily guess the ID or cryptographic key and gain access to restricted functionality.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
