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Fencer Vulns
medium 5.3

CVE-2026-9641 json

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

published 2026-06-12 4 mo ago modified 2026-10-26 13 d ago also EUVD-2026-36470

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • ARODLAND Crypt::PBKDF2 0.261630
  • libcrypt-pbkdf2-perl Debian 12 0.261630-1~deb13u1~deb12u1
  • libcrypt-pbkdf2-perl Debian 13 0.261630-1~deb13u1
  • libcrypt-pbkdf2-perl Debian 14 0.261630-1

debian advisories DEBIAN-CVE-2026-9641

  • perl-Crypt-PBKDF2 openSUSE Tumbleweed 0.261630-1.1

opensuse advisories openSUSE-SU-2026:11034-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-9641 updated cvss 7.5

perl-Crypt-PBKDF2: weak default algorithm and insufficient iterations

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • ARODLAND Crypt::PBKDF2

Classification

Weakness
  • CWE-916 Use of Password Hash With Insufficient Computational Effort

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.