Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.p
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.2
- http://www.openwall.com/lists/oss-security/2026/07/05/1
FAQ
What is CVE-2026-14570?
CVE-2026-14570 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-14570?
CVE-2026-14570 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-14570?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.