CVE-2026-4176

Name: CVE-2026-4176
Creator: NVD / NIST
Published: 2026-03-29T21:16:15.717+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.68%

Last modified Jun 17, 2026

CVE-2026-4176 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.68%

47.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
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

https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94Patch
https://lists.security.metacpan.org/cve-announce/msg/37638919/Third Party Advisory
https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/ChangesRelease Notes
https://metacpan.org/release/SHAY/perl-5.40.4/changesRelease Notes
https://metacpan.org/release/SHAY/perl-5.42.2/changesRelease Notes
https://www.cve.org/CVERecord?id=CVE-2026-3381Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/30/2Mailing List, Third Party Advisory

Timeline

Published: Mar 29, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-4176?

How severe is CVE-2026-4176?

CVE-2026-4176 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2026-4176?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-4176?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST