CVE-2026-9641

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

Published Jun 12, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade to version 0.261630 or later.


Vendor Workaround

Change the default algorithm to something stronger, such as "HMACSHA2", and the output_len accordingly (32 for SHA256). The number of iterations should also be increased (600,000 for SHA256, for example).

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Arodland
Arodland crypt::pbkdf2
Vendors & Products Arodland
Arodland crypt::pbkdf2
Type Values Removed Values Added
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations
Weaknesses CWE-916
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Jun 14, 2026, 2:46 PM
Reserved
May 26, 2026, 6:44 PM
Status
Deferred
Published
Jun 12, 2026, 4:16 PM
Modified
Oct 26, 2026, 11:10 AM