CVE-2026-41564CWE-335CWE-338

CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking

High · published April 23, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
36.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00431 · 36.1th percentile
Weaknesses
CWE-335 · Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG); CWE-338 · Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Published
2026-04-23T07:29Z
EPSS history
Timeline
  • 23 APR 07:29Z
    CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking
    cvelistv5