CVE-2026-4176: 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

Published Mar 29, 2026
·
Updated

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 Software

4 affected components
Perl Perl>=5.9.4<5.40.4-RC1, >=5.41.0<5.42.2-RC1, >=5.43.0<5.43.9
Perl Perl>=5.9.4<5.40.4
Perl Perl>=5.41.0<5.42.2
Perl Perl>=5.43.0<5.43.9

Remediation

Information

Update to Perl stable release 5.40.4 or 5.42.2 or later, which include Compress::Raw::Zlib 2.222.

Patch Available

https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94

Event History

Mar 29, 2026
CVE Published
via MITRE·08:50 PM
Data Sourced
via MITRE·08:50 PM
RemedyDescriptionWeakness
Data Sourced
via NVD·09:16 PM
RemedyDescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-4176?

CVE-2026-4176 is considered a medium severity vulnerability.

2

How do I fix CVE-2026-4176?

To fix CVE-2026-4176, upgrade your Perl installation to version 5.40.4-RC1 or later.

3

Which versions of Perl are affected by CVE-2026-4176?

CVE-2026-4176 affects Perl versions from 5.9.4 before 5.40.4-RC1, 5.41.0 before 5.42.2-RC1, and 5.43.0 before 5.43.9.

4

What components of Perl does CVE-2026-4176 impact?

CVE-2026-4176 impacts the Compress::Raw::Zlib component of Perl.

5

Is CVE-2026-4176 remotely exploitable?

CVE-2026-4176 may allow remote code execution, depending on how the affected version of Perl is used.

Company

Resources

Contact

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