What is CVE-2026-9638?

CVE-2026-9638 is a high-severity vulnerability in Arodland Crypt::pbkdf2, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 7.5/10. Published 2026-06-12.

How severe is CVE-2026-9638?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Arodland Crypt::pbkdf2

CVE-2026-9638

Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.

EPSS: 0.003 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Arodland Crypt::pbkdf2 — versions 0

Weakness classification (CWE)

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

References

9b29abf9-4ab0-4765-b253-1875cd9b441e
9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-9638?: CVE-2026-9638 is a high-severity vulnerability in Arodland Crypt::pbkdf2, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 7.5/10. Published 2026-06-12.
How severe is CVE-2026-9638?: High severity. CVSS v3 base score is 7.5 out of 10.