Bug 2452916 (CVE-2026-4176)

Summary: CVE-2026-4176 Perl: Compress::Raw::Zlib: zlib: Perl: Multiple vulnerabilities due to an outdated vendored zlib library
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: adudiak, crizzo, jkoehler, jmitchel, kshier, lphiri, pbohmill, sdawley, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Perl, stemming from its inclusion of an outdated `Compress::Raw::Zlib` module. This module bundles a vulnerable version of the `zlib` library, which is known to contain multiple security flaws, including CVE-2026-3381 and CVE-2026-27171. Exploitation of these underlying vulnerabilities could lead to various security impacts, depending on the specific flaw within `zlib`.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2453132    
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Description OSIDB Bzimport 2026-03-29 22:02:31 UTC
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.