CVE-2026-9641 (CVSS 5.3)

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0023

Probability of exploitation

0.13%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-916 CWE-916

References

Other 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

Frequently Asked Questions

What is CVE-2026-9641? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-9641? +

CVE-2026-9641 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0023, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-9641? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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