CVE-2026-27654

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"operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "NGINX Open Source y NGINX Plus tienen una vulnerabilidad en el m\u00f3dulo ngx_http_dav_module que podr\u00eda permitir a un atacante desencadenar un desbordamiento de b\u00fafer en el proceso de trabajador de NGINX; esta vulnerabilidad puede resultar en la terminaci\u00f3n del proceso de trabajador de NGINX o la modificaci\u00f3n de nombres de archivos de origen o destino fuera del directorio ra\u00edz de documentos. Este problema afecta a NGINX Open Source y NGINX Plus cuando el archivo de configuraci\u00f3n utiliza los m\u00e9todos MOVE o COPY del m\u00f3dulo DAV, ubicaci\u00f3n de prefijo (configuraci\u00f3n de ubicaci\u00f3n sin expresi\u00f3n regular) y directivas alias. El impacto en la integridad est\u00e1 restringido porque el usuario del proceso de trabajador de NGINX tiene privilegios bajos y no tiene acceso a todo el sistema. Nota: Las versiones de software que han alcanzado el Fin del Soporte T\u00e9cnico (EoTS) no son evaluadas."}], "id": "CVE-2026-27654", "lastModified": "2026-07-15T02:19:09.470", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "f5sirt@f5.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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"modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "f5sirt@f5.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27654", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-24T15:14:50.235649Z", 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{"bugzilla": {"description": "NGINX: NGINX: Denial of Service or file modification via buffer overflow in ngx_http_dav_module", "id": "2450776", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450776"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["A flaw was found in NGINX. A remote attacker can exploit a buffer overflow vulnerability within the ngx_http_dav_module module. This occurs when the NGINX configuration uses DAV module MOVE or COPY methods in conjunction with prefix location and alias directives. Successful exploitation may lead to the termination of the NGINX worker process, resulting in a Denial of Service (DoS), or allow for the modification of source or destination file names outside the intended document root."], "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-2026-27654", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nginx:1.26/nginx", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-24T14:13:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27654\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27654\nhttps://my.f5.com/manage/s/article/K000160382"], "threat_severity": "Important"}

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