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Full vulnerability report · 2026
CVE-2026-3381High confidence

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib

PMQS · Compress::Raw::Zlib

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
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.79% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs PMQS Compress::Raw::Zlib and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Alpine, Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

7 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainperl-compress-raw-zlibVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.222-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainperl-compress-raw-zlibVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.222-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainperl-compress-raw-zlibVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.222-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourcelibcompress-raw-zlib-perlVendor fix publishedDebian records a fixed source-package version for this release.2.011-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcelibcompress-raw-zlib-perlVendor fix publishedDebian records a fixed source-package version for this release.2.011-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcelibcompress-raw-zlib-perlVendor fix publishedDebian records a fixed source-package version for this release.2.011-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcelibcompress-raw-zlib-perlVendor fix publishedDebian records a fixed source-package version for this release.2.011-2Debian Security Tracker ↗Source updated 5 Oct 2026
Optional official sources

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

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

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-2026-9520

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

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib. Compress::Raw::Zlib includes a copy of the zlib library. Compress::Raw::Zlib version 2.220 includes zlib 1.3.2, which addresses findings fron the 7ASecurity audit of zlib. The includes fixs for CVE-2026-27171.

What

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib. Compress::Raw::Zlib includes a copy of the zlib library. Compress::Raw::Zlib version 2.220 includes zlib 1.3.2, which addresses findings fron the 7ASecurity audit of zlib. The includes fixs for CVE-2026-27171.

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

Compress::Raw::Zlib versions through 2.219 for Perl use potentially insecure versions of zlib. Compress::Raw::Zlib includes a copy of the zlib library. Compress::Raw::Zlib version 2.220 includes zlib 1.3.2, which addresses findings fron the 7ASecurity audit of zlib. The includes fixs for CVE-2026-27171.

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-2026-1032IBM Tivoli Network Manager: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM Tivoli Network Manager ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2026-0835cPanel cPanel/WHM: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in cPanel cPanel/WHM ausnutzen, um Sicherheitsmaßnahmen zu umgehen, XSS und SSRF Angriffe durchzuführen, Informationen offenzulegen und potentiell Code auszuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260311Security Bulletin 11 Mar 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 11 Mar 2026, published on 11 March 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

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

d?id=CVE-2026-27727 Référence CVE CVE-2026-27830 https://www.cve.org/CVERecord?id=CVE-2026-27830 Référence CVE CVE-2026-27970 https://www.cve.org/CVERecord?id=CVE-2026-27970 Référence CVE CVE-2026-29145 https://www.cve.org/CVERecord?id=CVE-2026-29145 Référence CVE CVE-2026-29146 https://www.cve.org/CVERecord?id=CVE-2026-29146 Référence CVE CVE-2026-32635 https://www.cve.org/CVERecord?id=CVE-2026-32635 Référence CVE CVE-2026-33227 https://www.cve.org/CVERecord?id=CVE-2026-33227 Référence CVE CVE-2026-33244 https://www.cve.org/CVERecord?id=CVE-2026-33244 Référence CVE CVE-2026-33245 https://www.cve.org/CVERecord?id=CVE-2026-33245 Référence CVE CVE-2026-3381 https://www.cve.org/CVERecord?id=CVE-2026-3381 Référence CVE CVE-2026-33870 https://www.cve.org/CVERecord?id=CVE-2026-33870 Référence CVE CVE-2026-33871 https://www.cve.org/CVERecord?id=CVE-2026-33871 Référence CVE CVE-2026-34077 https://www.cve.org/CVERecord?id=CVE-2026-34077 Référence CVE CVE-2026-34180 https://www.cve.org/CVERecord?id=CVE-2026-34180 Référence CVE CVE-2026-34182 https://www.cve.org/CVERecord?id=CVE-2026-34182 Référence CVE CVE-2026-34197 https://www.cve.org/CVERecord?id=CVE-2026-34197 Référence CVE CVE-2026-34483 https://www.cve.org/CVERecord?id=CVE-2026-34483 Référence CVE CVE-2026-34487 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0284Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-012345The Perl FoundationのPerlにおける不特定の脆弱性

Perlのバージョン5.9.4から5.40.4-RC1の前、5.41.0から5.42.2-RC1の前、および5.43.0から5.43.9の前には、脆弱なバージョンのCompress::Raw::Zlibが含まれています。Compress::Raw::ZlibはPerlパッケージにデュアルライフコアモジュールとして含まれており、複数の脆弱性を持つvendored版のzlibを使用しているため影響を受けます。バンドルされているCompress::Raw::ZlibはPerlのbleadコミットc75ae9cc164205e1b6d6dbd57bd2c65c8593fe94でバージョン2.221に更新されました。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-008056Paul Marquess (pmqs)のCompress::Raw::Zlibにおける入力で指定された数量の不適切な検証に関する脆弱性

Compress::Raw::Zlib のバージョン2.219までのPerl用Compress::Raw::Zlibは、潜在的に安全でないバージョンのzlibを使用していました。Compress::Raw::Zlibにはzlibライブラリのコピーが含まれています。Compress::Raw::Zlib バージョン2.220にはzlib 1.3.2が含まれており、これはzlibの7Aセキュリティ監査の結果に対応しています。この更新には関連するセキュリティ修正が含まれています。

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
Compress::Raw::Zlib: ≤ 2.219
Fixed
Upgrade to Compress::Raw::Zlib 2.220 or later.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 5 Mar 2026 · Last source change 11 Mar 2026, 15:00 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-2026-9520
Product sourceCNA
Remediation sourceCVE/CNA references
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
ENISA EUVD · EUVD-2026-9520↗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-2026-3381 · cve.blacktree.nl