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Full vulnerability report · 2026
CVE-2026-4176High confidence

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

SHAY · perl

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-4176 · CSAF 2.0 · revision 3 · finalRed Hat Product SecurityPerl: Compress::Raw::Zlib: zlib: Perl: Multiple vulnerabilities due to an outdated vendored zlib library
27 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • perl as a component of Red Hat Enterprise Linux 8
  • perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 8
  • perl-Devel-Peek as a component of Red Hat Enterprise Linux 8
  • perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 8
  • perl-Errno as a component of Red Hat Enterprise Linux 8
  • perl-ExtUtils-Embed as a component of Red Hat Enterprise Linux 8
  • perl-ExtUtils-Miniperl as a component of Red Hat Enterprise Linux 8
  • perl-IO as a component of Red Hat Enterprise Linux 8
  • perl-IO-Zlib as a component of Red Hat Enterprise Linux 8
  • perl-Locale-Maketext-Simple as a component of Red Hat Enterprise Linux 8
  • perl-Math-Complex as a component of Red Hat Enterprise Linux 8
  • perl-Memoize as a component of Red Hat Enterprise Linux 8
Summary
A flaw was found in Perl, stemming from its inclusion of an outdated `Compress::Raw::Zlib` module.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`.
Remediation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-17044

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

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.

What

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.

Why

The product has a dependency on a third-party component that contains one or more known vulnerabilities.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product has a dependency on a third-party component that contains one or more known vulnerabilities.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Dependency on Vulnerable Third-Party Component → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1395 ↗

CWE-1395: Dependency on Vulnerable Third-Party Component. The product has a dependency on a third-party component that contains one or more known vulnerabilities.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-1395
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-W-2026-2887Oracle Communications: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory
BSI · German · WID-SEC-W-2026-2437Oracle Communications: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory
BSI · German · WID-SEC-W-2026-2438Oracle Commerce: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Commerce ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory
BSI · German · WID-SEC-W-2026-2434Oracle TimesTen In-Memory Database: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle TimesTen In-Memory Database ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory
BSI · German · WID-SEC-W-2026-0901Perl: Schwachstelle ermöglicht nicht spezifizierten Angriff

Ein Angreifer kann eine Schwachstelle in Perl ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0933Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-34487 Référence CVE CVE-2026-34500 https://www.cve.org/CVERecord?id=CVE-2026-34500 Référence CVE CVE-2026-34993 https://www.cve.org/CVERecord?id=CVE-2026-34993 Référence CVE CVE-2026-35554 https://www.cve.org/CVERecord?id=CVE-2026-35554 Référence CVE CVE-2026-39304 https://www.cve.org/CVERecord?id=CVE-2026-39304 Référence CVE CVE-2026-40046 https://www.cve.org/CVERecord?id=CVE-2026-40046 Référence CVE CVE-2026-40181 https://www.cve.org/CVERecord?id=CVE-2026-40181 Référence CVE CVE-2026-40198 https://www.cve.org/CVERecord?id=CVE-2026-40198 Référence CVE CVE-2026-40199 https://www.cve.org/CVERecord?id=CVE-2026-40199 Référence CVE CVE-2026-4176 https://www.cve.org/CVERecord?id=CVE-2026-4176 Référence CVE CVE-2026-41841 https://www.cve.org/CVERecord?id=CVE-2026-41841 Référence CVE CVE-2026-41842 https://www.cve.org/CVERecord?id=CVE-2026-41842 Référence CVE CVE-2026-41843 https://www.cve.org/CVERecord?id=CVE-2026-41843 Référence CVE CVE-2026-41844 https://www.cve.org/CVERecord?id=CVE-2026-41844 Référence CVE CVE-2026-41846 https://www.cve.org/CVERecord?id=CVE-2026-41846 Référence CVE CVE-2026-41848 https://www.cve.org/CVERecord?id=CVE-2026-41848 Référence CVE CVE-2026-41850 https://www.cve.org/CVERecord?id=CVE-2026-41850 Référence CVE CVE-2026-41851 https://www.cve.org/CVERecord?id=C

Official advisory
NCSC-NL · Dutch · NCSC-2026-0309Kwetsbaarheden verholpen in Oracle Communications

Multiple Perl versions contain a vulnerable Compress::Raw::Zlib module with outdated zlib libraries exposing several CVEs, while Oracle Commerce Guided Search 11.4.0 has a critical unauthenticated remote compromise vulnerability with a CVSS score of 9.8.

Official advisory
NCSC-NL · Dutch · NCSC-2026-0256Kwetsbaarheden verholpen in Oracle Communications

Certain Perl versions from 5.9.4 to before 5.40.4-RC1, 5.41.0 to before 5.42.2-RC1, and 5.43.0 to before 5.43.9 include a vulnerable Compress::Raw::Zlib module with an outdated zlib library containing multiple security flaws including CVE-2026-3381 and CVE-2026-27171.

Official advisory
NCSC-NL · Dutch · NCSC-2026-0255Kwetsbaarheden verholpen in Oracle Commerce Platform

Certain Perl versions from 5.9.4 to before 5.40.4-RC1, 5.41.0 to before 5.42.2-RC1, and 5.43.0 to before 5.43.9 include a vulnerable Compress::Raw::Zlib module with an outdated zlib library containing multiple security flaws including CVE-2026-3381 and CVE-2026-27171.

Official advisory
NCSC-NL · Dutch · NCSC-2026-0254Kwetsbaarheden verholpen in Oracle database producten

Certain Perl versions from 5.9.4 to before 5.40.4-RC1, 5.41.0 to before 5.42.2-RC1, and 5.43.0 to before 5.43.9 include a vulnerable Compress::Raw::Zlib module with an outdated zlib library containing multiple security flaws including CVE-2026-3381 and CVE-2026-27171.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
perl as a component of Red Hat Enterprise Linux 8; perl-Attribute-Handlers as a component of Red Hat Enterprise Linux 8; perl-Devel-Peek as a component of Red Hat Enterprise Linux 8; perl-Devel-SelfStubber as a component of Red Hat Enterprise Linux 8; perl-Errno as a component of Red Hat Enterprise Linux 8; perl-ExtUtils-Embed as a component of Red Hat Enterprise Linux 8; perl-ExtUtils-Miniperl as a component of Red Hat Enterprise Linux 8; perl-IO as a component of Red Hat Enterprise Linux 8; perl-IO-Zlib as a component of Red Hat Enterprise Linux 8; perl-Locale-Maketext-Simple as a component of Red Hat Enterprise Linux 8; perl-Math-Complex as a component of Red Hat Enterprise Linux 8; perl-Memoize as a component of Red Hat Enterprise Linux 8; perl-Module-Loaded as a component of Red Hat Enterprise Linux 8; perl-Net-Ping as a component of Red Hat Enterprise Linux 8; perl-Pod-Html as a component of Red Hat Enterprise Linux 8; perl-SelfLoader as a component of Red Hat Enterprise Linux 8; perl-Test as a component of Red Hat Enterprise Linux 8; perl-Time-Piece as a component of Red Hat Enterprise Linux 8; perl-devel as a component of Red Hat Enterprise Linux 8; perl-interpreter as a component of Red Hat Enterprise Linux 8; perl-libnetcfg as a component of Red Hat Enterprise Linux 8; perl-libs as a component of Red Hat Enterprise Linux 8; perl-macros as a component of Red Hat Enterprise Linux 8; perl-open as a component of Red Hat Enterprise Linux 8; perl-tests as a component of Red Hat Enterprise Linux 8; perl-utils as a component of Red Hat Enterprise Linux 8; perl.src as a component of Red Hat Enterprise Linux 8
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
04

Evidence and provenance

Published 29 Mar 2026 · Last source change 30 Mar 2026, 15:35 UTC · CWE-1395 · Dependency on Vulnerable Third-Party Component

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-17044
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-17044↗Vendor CSAF · Red Hat Product Security↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-4176 · cve.blacktree.nl