CVE-2026-41564
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking
Description
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking. The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery. This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process.
INFO
Published Date :
April 23, 2026, 8:16 a.m.
Last Modified :
May 12, 2026, 1:39 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update CryptX for Perl to version 0.088 or later.
- Ensure PRNG reseeding occurs after forking.
- Avoid reusing PRNG objects across forked processes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41564.
| URL | Resource |
|---|---|
| https://github.com/DCIT/perl-CryptX/commit/9a1dd3e0c27d68e32450be5538b864c2b115ee15.patch | Patch |
| https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 | Vendor Advisory |
| https://metacpan.org/release/MIK/CryptX-0.088 | Product |
| http://www.openwall.com/lists/oss-security/2026/04/23/2 | Mailing List Third Party Advisory |
| https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41564 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41564
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41564 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41564 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 12, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:dcit:cryptx:*:*:*:*:*:perl:*:* versions up to (excluding) 0.088 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/23/2 Types: Mailing List, Third Party Advisory Added Reference Type CPANSec: https://github.com/DCIT/perl-CryptX/commit/9a1dd3e0c27d68e32450be5538b864c2b115ee15.patch Types: Patch Added Reference Type CISA-ADP: https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 Types: Vendor Advisory Added Reference Type CPANSec: https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 Types: Vendor Advisory Added Reference Type CPANSec: https://metacpan.org/release/MIK/CryptX-0.088 Types: Product -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added Reference https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 23, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/23/2 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Apr. 23, 2026
Action Type Old Value New Value Added Description CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking. The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery. This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process. Added CWE CWE-338 Added CWE CWE-335 Added Reference https://github.com/DCIT/perl-CryptX/commit/9a1dd3e0c27d68e32450be5538b864c2b115ee15.patch Added Reference https://github.com/DCIT/perl-CryptX/security/advisories/GHSA-24c2-gp6c-24c6 Added Reference https://metacpan.org/release/MIK/CryptX-0.088