What’s Vulnerable › Vulnerabilities

CVE-2026-9641: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-26
• Weakness: CWE-916

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.

Affected products

• ARODLAND Crypt::PBKDF2: before 0.261630 — fixed in 0.261630

How to fix

Upgrade to a fixed version: ARODLAND Crypt::PBKDF2 0.261630. Check the vendor advisory for mitigations.

References

• https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pbkdf2
• https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes
• http://www.openwall.com/lists/oss-security/2026/06/12/5
• http://www.openwall.com/lists/oss-security/2026/06/13/1
• http://www.openwall.com/lists/oss-security/2026/06/14/1
• http://www.openwall.com/lists/oss-security/2026/06/14/2
• http://www.openwall.com/lists/oss-security/2026/06/14/3

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