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Vulnerability · Published Jun 12, 2026 · Assigned by CPANSec

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

Medium 5.3

In plain English

A medium-severity security flaw in Crypt::PBKDF2 from ARODLAND. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 86.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libcrypt-pbkdf2-perl0.261630-1~deb13u1~deb12u1DEBIAN-CVE-2026-9641
Debian:13libcrypt-pbkdf2-perl0.261630-1~deb13u1DEBIAN-CVE-2026-9641
Debian:14libcrypt-pbkdf2-perl0.261630-1DEBIAN-CVE-2026-9641
Ubuntu:22.04:LTSlibcrypt-pbkdf2-perlno fix listedUBUNTU-CVE-2026-9641
Ubuntu:24.04:LTSlibcrypt-pbkdf2-perlno fix listedUBUNTU-CVE-2026-9641
Ubuntu:25.10libcrypt-pbkdf2-perlno fix listedUBUNTU-CVE-2026-9641
Ubuntu:26.04:LTSlibcrypt-pbkdf2-perlno fix listedUBUNTU-CVE-2026-9641
Ubuntu:26.10libcrypt-pbkdf2-perlno fix listedUBUNTU-CVE-2026-9641

Affected products (as reported)

VendorProductVersions
ARODLAND Crypt::PBKDF2 0 – before 0.261630

Weakness: CWE-916 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References