{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4176", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-03-14T16:17:19.077Z", "datePublished": "2026-03-29T20:50:51.058Z", "dateUpdated": "2026-03-30T15:35:08.162Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "perl", "product": "perl", "repo": "https://github.com/Perl/perl5", "vendor": "SHAY", "versions": [{"lessThan": "5.40.4-RC1", "status": "affected", "version": "5.9.4", "versionType": "custom"}, {"lessThan": "5.42.2-RC1", "status": "affected", "version": "5.41.0", "versionType": "custom"}, {"lessThan": "5.43.9", "status": "affected", "version": "5.43.0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Bernhard Schmalhofer"}], "descriptions": [{"lang": "en", "value": "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.\n\nCompress::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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-1395", "description": "CWE-1395 Dependency on Vulnerable Third-Party Component", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-03-29T20:50:51.058Z"}, "references": [{"tags": ["vendor-advisory", "related", "vdb-entry"], "url": "https://www.cve.org/CVERecord?id=CVE-2026-3381"}, {"tags": ["vendor-advisory"], "url": "https://lists.security.metacpan.org/cve-announce/msg/37638919/"}, {"tags": ["patch"], "url": "https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/SHAY/perl-5.40.4/changes"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/SHAY/perl-5.42.2/changes"}], "solutions": [{"lang": "en", "value": "Update to Perl stable release 5.40.4 or 5.42.2 or later, which include Compress::Raw::Zlib 2.222."}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-02-27T00:00:00.000Z", "value": "Compress::Raw::Zlib 2.221 committed to Perl blead."}, {"lang": "en", "time": "2026-03-07T00:00:00.000Z", "value": "CVE-2026-3381 published for Compress::Raw::Zlib."}, {"lang": "en", "time": "2026-03-14T00:00:00.000Z", "value": "CVE-2026-4176 reserved."}, {"lang": "en", "time": "2026-03-29T00:00:00.000Z", "value": "Perl 5.40.4 and 5.42.2 released."}], "title": "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", "workarounds": [{"lang": "en", "value": "Install Compress::Raw::Zlib 2.220 or later into your @INC include path, so it takes precedence over the vulnerable core module shipped with Perl.\n\nSome OS distributions patch their perl package to build Compress::Raw::Zlib against the system zlib rather than the vendored copy. Users of these distributions may not be affected if their system zlib has been updated to 1.3.2 or later, or includes backported patches for the relevant vulnerabilities."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/30/2"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-30T04:56:37.564Z"}}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-1395", "lang": "en", "description": "CWE-1395 Dependency on Vulnerable Third-Party Component"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-03-30T15:34:29.395269Z", "id": "CVE-2026-4176", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-30T15:35:08.162Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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.\n\nCompress::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."}], "id": "CVE-2026-4176", "lastModified": "2026-03-30T16:16:08.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-03-29T21:16:15.717", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://lists.security.metacpan.org/cve-announce/msg/37638919/"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/SHAY/perl-5.40.4/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/SHAY/perl-5.42.2/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://www.cve.org/CVERecord?id=CVE-2026-3381"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/03/30/2"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Awaiting Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.9.4,5.40.4-RC1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.41.0,5.42.2-RC1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.43.0,5.43.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "perl", "source": "cna", "vendor": "SHAY"}, "product": "perl", "vendor": "shay"}], "analysis": {"en": {"generated_at": "2026-03-29T22:20:38.744753+00:00", "value": {"mitigation_remediation": ["Update Perl to a stable release 5.40.4, 5.42.2 or later that includes Compress::Raw::Zlib 2.222.", "If a quick upgrade is not possible, install Compress::Raw::Zlib 2.220 or newer into the Perl @INC path so it overrides the bundled module.", "Ensure any system zlib used by your Perl build is at least version 1.3.2 or contains the relevant backported patches.", "Consider rebuilding Perl from source against the system zlib to eliminate the vulnerable bundled copy."], "summary": {"action": "Immediate Patch", "impact": "Remote code execution through a vulnerable compression library in Perl"}, "threat_synthesis": {"affected_systems": "The affected products are Perl distributions from the SHAY vendor. Versions before 5.40.4\u2011RC1, before 5.42.2\u2011RC1, and before 5.43.9 are vulnerable because they include a vulnerable Compress::Raw::Zlib bundle. Some operating\u2011system packages that build Perl against the system zlib are not affected if the system library has been upgraded to 1.3.2 or later, or if their zlib patches address the known issues.", "description_and_impact": "Perl embeds the Compress::Raw::Zlib module, which in many releases uses a vendored copy of zlib that contains known security bugs. The vulnerability allows an attacker to supply specially crafted compressed data that triggers one or more of the zlib flaws, potentially leading to arbitrary code execution or denial of service when the data is processed by Perl scripting or applications that depend on this module. Because the module is part of the Perl core, the impact spans any context in which Perl is executed, from standalone scripts to web servers or system utilities. The vulnerability is therefore significant in terms of confidentiality, integrity, and availability.", "risk_and_exploitability": "The CVSS score is not supplied, but the vulnerability is monetarily high due to its remote nature and the ability to execute arbitrary code. The EPSS score is unavailable, and the flaw is not listed in the CISA KEV catalog. Attackers can exploit the issue by delivering malicious compressed payloads to any Perl process that loads the core module; if the process runs with elevated privileges, the damage could extend system\u2011wide. The lack of an official patch until newer releases means that organizations using the specified Perl versions should treat this as a high\u2011risk exposure and remediate promptly."}}}}, "created": "2026-03-30T06:58:00.716032+00:00", "updated": "2026-03-30T07:03:52.106014+00:00", "vendors": ["shay", "shay$PRODUCT$perl"]}