CVE-2026-4176

CRITICAL EPSS 47.6%

Published Mar 29, 20263mo ago · Modified Jun 17, 20262w ago

9.8 CVSS 3.1

Critical

Published Mar 29, 2026 3mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

9.8

Exploitability

3.9

Impact

5.9

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality High

Integrity High

Availability High

Threat Intelligence

EPSS Exploit Probability

47.6% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Affected Products 3

Vendor	Product	Version	Range
perl	perl	*	≥5.9.4 – <5.40.4
perl	perl	*	≥5.41.0 – <5.42.2
perl	perl	*	≥5.43.0 – <5.43.9

References 7

openwall.com http://www.openwall.com/lists/oss-security/2026/03/30/2

Mailing ListThird Party Advisory
github.com https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94

Patch
lists.security.metacpan.org https://lists.security.metacpan.org/cve-announce/msg/37638919/

Third Party Advisory
metacpan.org https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes

Release Notes
metacpan.org https://metacpan.org/release/SHAY/perl-5.40.4/changes

Release Notes
metacpan.org https://metacpan.org/release/SHAY/perl-5.42.2/changes

Release Notes
cve.org https://www.cve.org/CVERecord?id=CVE-2026-3381

Third Party Advisory

Remediation

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

Patch