{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "CVE-2026-27654: fix heap buffer overflow in ngx_http_dav_module COPY/MOVE with alias", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777396606", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777396606" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos8.4els/advisories/2026/clsa-2026_1777396606.json" } ], "tracking": { "current_release_date": "2026-04-28T17:17:36Z", "generator": { "date": "2026-04-28T17:17:36Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1777396606", "initial_release_date": "2026-04-28T17:17:36Z", "revision_history": [ { "date": "2026-04-28T17:17:36Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "nginx: Fix of CVE-2026-27654" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 8.4", "product": { "name": "Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:8.4:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "nginx:1.14:8040020260424075228:9edba152", "product": { "name": "nginx:1.14:8040020260424075228:9edba152", "product_id": "nginx:1.14:8040020260424075228:9edba152", "product_identification_helper": { "purl": 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"product_identification_helper": { "purl": "pkg:rpm/cloudlinux/nginx-mod-http-image-filter@1.14.1-9.module_el8.4.0%2B2374%2B826f574f.tuxcare.els5?arch=x86_64&epoch=1" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "nginx:1.14:8040020260424075228:9edba152 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:nginx:1.14:8040020260424075228:9edba152" }, "product_reference": "nginx:1.14:8040020260424075228:9edba152", "relates_to_product_reference": "CentOS-8.4" }, { "category": "default_component_of", "full_product_name": { "name": "nginx-mod-mail-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:nginx-mod-mail-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64" }, "product_reference": 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"full_product_name": { "name": "nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64 as a component of Community Enterprise Operating System 8.4", "product_id": "CentOS-8.4:nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64" }, "product_reference": "nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "relates_to_product_reference": "CentOS-8.4" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27654", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "CentOS-8.4:nginx-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-all-modules-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-filesystem-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-perl-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-xslt-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-mail-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-stream-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx:1.14:8040020260424075228:9edba152" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-27654" }, { "category": "external", "summary": "https://my.f5.com/manage/s/article/K000160382", "url": "https://my.f5.com/manage/s/article/K000160382" } ], "release_date": "2026-03-24T15:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-04-28T17:16:49.593481Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1777396606", "product_ids": [ "CentOS-8.4:nginx-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-all-modules-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-filesystem-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-perl-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-xslt-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-mail-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-stream-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx:1.14:8040020260424075228:9edba152" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777396606" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1" }, "products": [ "CentOS-8.4:nginx-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-all-modules-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-filesystem-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.noarch", "CentOS-8.4:nginx-mod-http-image-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-perl-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-http-xslt-filter-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-mail-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx-mod-stream-1:1.14.1-9.module_el8.4.0+2374+826f574f.tuxcare.els5.x86_64", "CentOS-8.4:nginx:1.14:8040020260424075228:9edba152" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }