CVE-2026-4176: Perl

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Perl Perl: from 5.9.4, before 5.40.4 (fixed in 5.40.4); from 5.41.0, before 5.42.2 (fixed in 5.42.2); from 5.43.0, before 5.43.9 (fixed in 5.43.9)

Published 2026-03-29. Last modified 2026-06-17.