CVE-2026-52747

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{"affected": [{"affectedData": [{"product": "ModSecurity", "vendor": "owasp-modsecurity", "versions": [{"status": "affected", "version": "< 3.0.16"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:*", "matchCriteriaId": "7EA032F7-7C09-40A5-9936-C6C59E45DACE", "versionEndExcluding": "3.0.16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16."}, {"lang": "es", "value": "ModSecurity es un motor de cortafuegos de aplicaciones web (WAF) de c\u00f3digo abierto y multiplataforma para Apache, IIS y Nginx. Antes de la versi\u00f3n 3.0.16, el analizador del cuerpo de la solicitud multipart/form-data en libmodsecurity elimina silenciosamente los saltos de l\u00ednea incrustados de los valores de campos de formulario que no son archivos antes de exportarlos a ARGS y ARGS_POST porque src/request_body_processor/multipart.cc sobrescribe los bytes reservados en m_reserve en lugar de a\u00f1adir el b\u00fafer actual. Esto crea un diferencial de analizador entre ModSecurity y las aplicaciones de backend que preservan los saltos de l\u00ednea en los campos de formulario, permitiendo que las reglas que inspeccionan ARGS o ARGS_POST pasen por alto cargas \u00fatiles cuya sintaxis peligrosa depende de un salto de l\u00ednea. Este problema se solucion\u00f3 en la versi\u00f3n 3.0.16."}], "id": "CVE-2026-52747", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52747", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-13T17:48:09.249154Z", "version": "2.0.3"}}]}, "published": "2026-07-10T22:16:42.697", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-180"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "ModSecurity: ModSecurity: Security rule bypass due to incorrect handling of line breaks in form data", "id": "2499232", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499232"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-179", "details": ["A flaw was found in ModSecurity, an open-source web application firewall (WAF). The multipart/form-data request body parser in libmodsecurity incorrectly handles embedded line breaks in non-file form-field values. This discrepancy between ModSecurity and backend applications, which preserve line breaks, can allow an attacker to bypass security rules. This bypass could lead to the execution of dangerous payloads that rely on line breaks, potentially resulting in a security compromise."], "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-2026-52747", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-10T21:42:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52747\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52747\nhttps://github.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7\nhttps://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16\nhttps://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88"], "statement": "This issue is classified as Moderate severity primarily because:\nConditions for Exploitation: Successful exploitation requires a specific scenario where the backend application preserves line breaks and is inherently vulnerable to a payload that utilizes those line breaks. \nAdditionally, the ModSecurity configuration must rely on rules inspecting the affected ARGS or ARGS_POST variables to allow the bypass to occur.\nImpact Limitations: The vulnerability functions solely as a security control bypass, allowing potentially malicious requests to evade the Web Application Firewall (WAF). It does not directly cause privilege escalation, data corruption, or arbitrary code execution on the host system. The actual impact depends entirely on whether the backend application being protected is vulnerable to the bypassed requests.", "threat_severity": "Moderate"}

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