Vulnerability Report

CVE-2026-4176

Title: Vulnerability in Perl due to bundled Compress::Raw::Zlib

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-4176.

CWE Category NVD-CWE-noinfo

Published Date Mar 29, 2026

Modified Date Apr 22, 2026

Exploit Status Not Found

Score 9.8 CVSS v

Exploit Probability (EPSS)

0.68%

Vulnerability Summary

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. 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.

Impacted Vendors

perl 1

larry_wall 1

Reference Links

https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94 https://lists.security.metacpan.org/cve-announce/msg/37638919/ https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes https://metacpan.org/release/SHAY/perl-5.40.4/changes https://metacpan.org/release/SHAY/perl-5.42.2/changes https://www.cve.org/CVERecord?id=CVE-2026-3381

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns