by Kastro
Paper/Archive/CVE-2026-4176

CVE-2026-4176

SHAY perl — 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

EPSS 0.7%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 54.6.546 × 2010.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
perl5.9.4 – < 5.40.4-RC15.40.4-RC1CNA
perl5.41.0 – < 5.42.2-RC15.42.2-RC1CNA
perl5.43.0 – < 5.43.95.43.9CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorycve.org/CVERecord?id=CVE-2026-3381advisorylists.security.metacpan.org/cve-announce/msg/37638919patchgithub.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94refmetacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changesrefmetacpan.org/release/SHAY/perl-5.40.4/changesrefmetacpan.org/release/SHAY/perl-5.42.2/changesrefopenwall.com/lists/oss-security/2026/03/30/2