CVE-2026-4176

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{"affected": [{"affectedData": [{"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"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*", "matchCriteriaId": "CB7DC630-9F3F-404F-9759-882BFCC79961", "versionEndExcluding": "5.40.4", "versionStartIncluding": "5.9.4", "vulnerable": true}, {"criteria": "cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*", "matchCriteriaId": "19F3A1E9-F479-4537-AA41-6800D49A3A68", "versionEndExcluding": "5.42.2", "versionStartIncluding": "5.41.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*", "matchCriteriaId": "A21CB5D2-7B78-485A-A6E8-5C2BBAE99334", "versionEndExcluding": "5.43.9", "versionStartIncluding": "5.43.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}, {"lang": "es", "value": "Las versiones de Perl desde la 5.9.4 anteriores a la 5.40.4-RC1, desde la 5.41.0 anteriores a la 5.42.2-RC1, y desde la 5.43.0 anteriores a la 5.43.9 contienen una versi\u00f3n vulnerable de Compress::Raw::Zlib.\n\nCompress::Raw::Zlib est\u00e1 incluido en el paquete de Perl como un m\u00f3dulo central de doble vida, y es vulnerable a CVE-2026-3381 debido a una versi\u00f3n empaquetada de zlib que tiene varias vulnerabilidades, incluyendo CVE-2026-27171. El Compress::Raw::Zlib empaquetado fue actualizado a la versi\u00f3n 2.221 en el commit de Perl blead c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94."}], "id": "CVE-2026-4176", "lastModified": "2026-06-17T10:56:07.190", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4176", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-30T15:34:29.395269Z", "version": "2.0.3"}}]}, "published": "2026-03-29T21:16:15.717", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Patch"], "url": "https://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Third Party Advisory"], "url": "https://lists.security.metacpan.org/cve-announce/msg/37638919/"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Release Notes"], "url": "https://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Release Notes"], "url": "https://metacpan.org/release/SHAY/perl-5.40.4/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Release Notes"], "url": "https://metacpan.org/release/SHAY/perl-5.42.2/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Third Party Advisory"], "url": "https://www.cve.org/CVERecord?id=CVE-2026-3381"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/03/30/2"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "Perl: Compress::Raw::Zlib: zlib: Perl: Multiple vulnerabilities due to an outdated vendored zlib library", "id": "2452916", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452916"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-1104", "details": ["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.\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.", "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`."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-4176", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "perl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "perl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "perl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "perl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "perl:5.32/perl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "perl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-29T20:50:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4176\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4176\nhttps://github.com/Perl/perl5/commit/c75ae9cc164205e1b6d6dbd57bd2c65c8593fe94\nhttps://lists.security.metacpan.org/cve-announce/msg/37638919/\nhttps://metacpan.org/release/PMQS/Compress-Raw-Zlib-2.221/source/Changes\nhttps://metacpan.org/release/SHAY/perl-5.40.4/changes\nhttps://metacpan.org/release/SHAY/perl-5.42.2/changes\nhttps://www.cve.org/CVERecord?id=CVE-2026-3381"], "statement": "This is an Important vulnerability affecting Red Hat Enterprise Linux and OpenShift Container Platform. The Perl package includes an outdated `Compress::Raw::Zlib` module, which bundles a vulnerable version of the `zlib` library. Exploitation of the underlying `zlib` flaws could lead to various security impacts, depending on the flaw exploited. The general impact is tied to the same impact as the original flaw being exploited.", "threat_severity": "Moderate"}

{"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": "2026-04-28T09:01:55.869172+00:00", "value": {"mitigation_remediation": ["Upgrade to a Perl stable release that includes Compress::Raw::Zlib\u00a02.222 or later (5.40.4, 5.42.2, or 5.43.9).", "If an immediate upgrade is not possible, install Compress::Raw::Zlib\u00a02.220 or newer into the @INC path so it overrides the vulnerable core module.", "For distributions that rebuild Perl against the system zlib, verify that the system zlib is at least version\u00a01.3.2 or that relevant patches have been applied; upgrade the library if necessary."], "summary": {"action": "Immediate Patch", "impact": "High impact, potential code execution"}, "threat_synthesis": {"affected_systems": "Perl releases from 5.9.4 to 5.40.3, from 5.41.0 to 5.42.1, and from 5.43.0 to 5.43.8 ship the vulnerable Compress::Raw::Zlib. The issue was resolved in Perl 5.40.4, 5.42.2, and 5.43.9, which bundle Compress::Raw::Zlib 2.222. Some Linux distributions rebuild Perl to link against the system zlib; if the system zlib is 1.3.2 or newer, or includes backported patches, the vulnerability may not apply.", "description_and_impact": "Compress::Raw::Zlib is a core module bundled with the Perl interpreter. The vendored copy of zlib is vulnerable to CVE-2026-3381 and related CVE-2026-27171. When the module processes compressed data, the underlying vulnerable zlib can be exploited, potentially leading to a high impact. Based on the high CVSS score, it is inferred that an attacker could achieve code execution or other severe compromise, but the exact attack outcome is not explicitly stated in the vendor\u2019s description.", "risk_and_exploitability": "The CVSS score of 9.8 indicates a high severity, and the EPSS score of < 1% shows low current exploitation data, but the high potential impact requires immediate attention. Based on the description of the bundled module\u2019s reliance on a vendored zlib implementation, it is inferred that the likely attack vector involves supplying specially crafted compressed data to a Perl process. This could occur through local file input or remote network interfaces that parse or decompress data within a Perl application. The vulnerability is not listed in the CISA KEV catalog, underscoring the need for proactive patching."}}}}, "created": "2026-03-30T06:58:00.716032+00:00", "updated": "2026-04-28T09:15:09.677577+00:00", "vendors": ["shay", "shay$PRODUCT$perl"]}