CVE WatchJul 6, 2026

CVE-2026-14570

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 r

CVSS

7.5

High

EPSS

0.5%

p40

KEV

—

Exploit Today

0-100

Published: Jul 5, 2026 · Last modified: Jul 6, 2026 · CWE-330

EPSS · 30d

0.2%EPSS · 30 days0.5%

2026-07-052026-07-16

Technical 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.

Official references

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