Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Perl | Perl | >= 5.9.4, < 5.40.4 |
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 ListThird Party Advisory
FAQ
What is CVE-2026-4176?
CVE-2026-4176 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 p...
How severe is CVE-2026-4176?
CVE-2026-4176 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-4176?
Check the references section above for vendor advisories and patch information. Affected products include: Perl Perl.