Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available

published 2026-05-26 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-32022

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available.

The random_bytes function fell back to using the built-in rand() function when none of the Perl modules Crypt::PRNG, Crypt::OpenSSL::Random, Net::SSLeay, Crypt::Random, or Bytes::Random::Secure were available.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8647 updated 2026-06-28 cvss 4.8

perl-Crypt-ScryptKDF: Crypt::ScryptKDF for Perl uses insecure random number source when no CSPRNG module is available

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-28)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

MIK Crypt::ScryptKDF

Classification

Weakness

CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Sources

CVE List CVE-2026-8647
NVD CVE-2026-8647

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary