CVE-2026-4176 Supply chain in perl

Critical 9.8 Published 29 Mar 2026 Updated 30 Mar 2026

Perl includes a vulnerable vendored zlib in Compress::Raw::Zlib, allowing attackers to exploit underlying zlib flaws like code execution or DoS.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-4176?

CVE-2026-4176 is a critical vulnerability in SHAY perl, published on 29 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-1395

Which versions are affected by CVE-2026-4176?

It affects 1 product.

Products include Perl Perl.

How do I fix CVE-2026-4176?

Upgrade to a fixed version.

Is CVE-2026-4176 being exploited?

There is no known exploitation of CVE-2026-4176 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2026-4176, AZL-81309, AZL-81318, AZL-81321, AZL-81327, AZL-81339 and 9 more.