# CVE-2026-4176: perl: Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulner...

CVE-2026-4176 is fixed in perl on 1 platform, first by DEBIAN-CVE-2026-4176, released March 29, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-4176
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 29, 2026

## Description

Perl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Zlib.  Compress::Raw::Zlib is included in the Perl package as a dual-life core module, and is vulnerable to CVE-2026-3381 due to a vendored version of zlib which has several vulnerabilities, including CVE-2026-27171. The bundled Compress::Raw::Zlib was updated to version 2.221 in Perl blead commit c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | perl Debian 12.15 (bookworm) | 5.10.0-21 | [DEBIAN-CVE-2026-4176](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4176.md) | Mar 29, 2026 |
| Linux | perl Debian 13.5 (trixie) | 5.10.0-21 | [DEBIAN-CVE-2026-4176](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4176.md) | Mar 29, 2026 |
| Linux | perl Debian 14 | 5.10.0-21 | [DEBIAN-CVE-2026-4176](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4176.md) | Mar 29, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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