# CVE-2026-9641: libcrypt-pbkdf2-perl: Crypt::PBKDF2 versions before 0.261630 for Perl have a weak default algorithm and number of iterations

CVE-2026-9641 is fixed in 2 products on 1 platform, first by FEDORA-2026-E8231B773D, released June 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-9641
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 12, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcrypt-pbkdf2-perl Debian 12.15 (bookworm) | 0.261630-1~deb13u1~deb12u1 | [DEBIAN-CVE-2026-9641](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9641.md) | Jun 24, 2026 |
| Linux | libcrypt-pbkdf2-perl Debian 13.5 (trixie) | 0.261630-1~deb13u1 | [DEBIAN-CVE-2026-9641](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9641.md) | Jun 24, 2026 |
| Linux | libcrypt-pbkdf2-perl Debian 14 | 0.261630-1 | [DEBIAN-CVE-2026-9641](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9641.md) | Jun 24, 2026 |
| Linux | perl-Crypt-PBKDF2 Fedora 43 | 0.261630-1.fc43 | [FEDORA-2026-E8231B773D](https://patchblox.com/security/data/fix/linux/fedora-2026-e8231b773d.md) | Jun 12, 2026 |
| Linux | perl-Crypt-PBKDF2 amzn 2023 | 0.261630-1.amzn2023.0.1 | [ALAS2023-2026-1891](https://patchblox.com/security/data/fix/linux/alas2023-2026-1891.md) | Jun 22, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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