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

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Summary

CVECVE-2026-14570
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-05 02:17:40 UTC
Updated2026-07-05 06:16:25 UTC
DescriptionCrypt::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.

Risk And Classification

Problem Types: CWE-330 | CWE-330 CWE-330 Use of Insufficiently Random Values

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TIMLEGGE CryptDSA affected 1.22 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/07/05/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.pm 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.21 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to version 1.22 or later, which draws the nonce and private key uniformly via rejection sampling (Crypt::DSA::Util::randombelow) with no forced high bit. Revoke and regenerate any keys used to sign with an affected version. Crypt::DSA was deprecated in version 1.20. You should migrate to another solution.

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