Bug 2497528

Summary:	CVE-2026-14570 perl-Crypt-DSA: Crypt::DSA: Private key recovery due to biased random number generation [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Jon Weiser <jweiser>
Component:	perl-Crypt-DSA	Assignee:	Paul Howarth <paul>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	paul, perl-devel
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["fa6c4716-7e81-4930-b2c0-9b91b5f8fe01"]}
Fixed In Version:	perl-Crypt-DSA-1.22-1.el10_2 perl-Crypt-DSA-1.22-1.el10_3 perl-Crypt-DSA-1.17-31.el9 perl-Crypt-DSA-1.17-31.el8	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-12 00:26:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2497106

Description Jon Weiser 2026-07-06 21:56:50 UTC

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.

Comment 1 Fedora Update System 2026-07-07 08:20:19 UTC

FEDORA-EPEL-2026-432fddaa41 (perl-Crypt-DSA-1.17-31.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-432fddaa41

Comment 2 Fedora Update System 2026-07-07 08:20:56 UTC

FEDORA-EPEL-2026-b426ab1b56 (perl-Crypt-DSA-1.17-31.el8) has been submitted as an update to Fedora EPEL 8.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b426ab1b56

Comment 3 Fedora Update System 2026-07-07 08:21:23 UTC

FEDORA-EPEL-2026-49e427dec0 (perl-Crypt-DSA-1.22-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-49e427dec0

Comment 4 Fedora Update System 2026-07-07 08:21:49 UTC

FEDORA-EPEL-2026-121cfa24e8 (perl-Crypt-DSA-1.22-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-121cfa24e8

Comment 5 Fedora Update System 2026-07-12 00:26:45 UTC

FEDORA-EPEL-2026-121cfa24e8 (perl-Crypt-DSA-1.22-1.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-07-12 00:26:54 UTC

FEDORA-EPEL-2026-49e427dec0 (perl-Crypt-DSA-1.22-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-07-12 00:41:06 UTC

FEDORA-EPEL-2026-432fddaa41 (perl-Crypt-DSA-1.17-31.el9) has been pushed to the Fedora EPEL 9 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-07-12 00:49:43 UTC

FEDORA-EPEL-2026-b426ab1b56 (perl-Crypt-DSA-1.17-31.el8) has been pushed to the Fedora EPEL 8 stable repository.
If problem still persists, please make note of it in this bug report.