https://bugzilla.redhat.com/show_bug.cgi?id=2497529
Bug ID: 2497529
Summary: CVE-2026-14570 perl-Crypt-DSA: Crypt::DSA: Private key
recovery due to biased random number generation
[fedora-all]
Product: Fedora
Version: rawhide
Status: NEW
Whiteboard: {"flaws": ["fa6c4716-7e81-4930-b2c0-9b91b5f8fe01"]}
Component: perl-Crypt-DSA
Keywords: Security, SecurityTracking
Severity: high
Priority: high
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected]
Blocks: 2497106
Target Milestone: ---
Classification: Fedora
Disclaimer: Community trackers are created by Red Hat Product Security team on
a best effort basis. Package maintainers are required to ascertain if the flaw
indeed affects their package, before starting the update process.
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.
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