CVE-2026-9638 Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts
The Perl Crypt::PBKDF2 library uses predictable random values for salts, weakening password hashing security and potentially aiding brute-force attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9638?
CVE-2026-9638 is a high-severity vulnerability in ARODLAND Crypt::PBKDF2, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-338
Which versions are affected by CVE-2026-9638?
How do I fix CVE-2026-9638?
Upgrade to a fixed version.
Is CVE-2026-9638 being exploited?
There is no known exploitation of CVE-2026-9638 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-9638, GHSA-3rw7-pf56-37cv, UBUNTU-CVE-2026-9638.