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…

PriorityP352critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.68%

48.5th percentile

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

9 ranges

Vendor	Product	Version range	Fixed in
debian	perl	< perl 5.10.0-21 (bookworm)	perl 5.10.0-21 (bookworm)
perl	perl	>= 0 < 0	0
perl	perl	>= 0 < 5.10.0-21	5.10.0-21
perl	perl	>= 0 < 5.10.0-21	5.10.0-21
perl	perl	>= 0 < 5.10.0-21	5.10.0-21
perl	perl	>= 0 < 5.10.0-21	5.10.0-21
perl	perl	>= 5.41.0 < 5.42.2	5.42.2
perl	perl	>= 5.43.0 < 5.43.9	5.43.9
perl	perl	>= 5.9.4 < 5.40.4	5.40.4

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

osv5.5MEDIUM

vendor_debian2.9LOW

vendor_redhat2.9LOW

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.