CVE-2026-9641 Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations
Weak default PBKDF2 settings in Perl library allow attackers to more easily crack hashed passwords.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9641?
CVE-2026-9641 is a medium-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 have a weak default algorithm and number of iterations.
The default algorithm is HMAC-SHA1, which should only be used for legacy systems.
These versions default to using 1000 iterations.
Depending on the chosen algorithm, 220,000 to 1,400,000 iterations should be used.
Weakness: CWE-916
Which versions are affected by CVE-2026-9641?
How do I fix CVE-2026-9641?
Upgrade to a fixed version.
Is CVE-2026-9641 being exploited?
There is no known exploitation of CVE-2026-9641 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-9641, GHSA-v9r4-9w2c-2xcp, UBUNTU-CVE-2026-9641.