CVE-2026-104269

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{"affected": [{"affectedData": [{"product": "ModSecurity", "vendor": "owasp-modsecurity", "versions": [{"status": "affected", "version": ">= 3.0.0, < 3.0.17"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 until 3.0.17, ModSecurity's multipart parser does not apply the RFC 2231 filename* parameter precedence used by common Go, Python, Node.js, and Java application parsers. A Content-Disposition header can provide a benign filename parameter for ModSecurity and a different encoded filename* value that the backend prefers, causing MULTIPART_FILENAME rules and the application to make security decisions on different names. Applications that use the backend-selected name for storage, extension checks, or content-type inference can therefore receive a filename that bypassed WAF inspection. PHP's native multipart parser is not affected by this discrepancy. This issue is fixed in version 3.0.17."}], "id": "CVE-2026-104269", "lastModified": "2026-11-12T22:18:35.610", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-104269", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-09T17:15:25.361996Z", "version": "2.0.3"}}]}, "published": "2026-11-05T16:17:29.377", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/owasp-modsecurity/ModSecurity/commit/463db0c840fa27bfba095b0406a63004a12884b0"}, {"source": "security-advisories@github.com", "url": "https://github.com/owasp-modsecurity/ModSecurity/commit/c6bd53d2dd96766b3afdc35d9929ebb20925d13d"}, {"source": "security-advisories@github.com", "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15"}, {"source": "security-advisories@github.com", "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17"}, {"source": "security-advisories@github.com", "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-5pww-8rfg-9crf"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-5pww-8rfg-9crf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "modsecurity: mod_security: ModSecurity: Security inspection bypass via multipart filename parameter discrepancy", "id": "2567712", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567712"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in ModSecurity. The multipart parser fails to properly prioritize parameter handling when processing filenames in Content-Disposition headers. A remote attacker can exploit this discrepancy by submitting a request containing both a benign filename and an encoded alternative that the backend application prefers. This allows an attacker to bypass Web Application Firewall (WAF) inspection rules, enabling uninspected or malicious files to reach the backend application."], "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-2026-104269", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Under investigation", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "mod_security", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "jbcs-httpd24-mod_security", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2026-11-05T15:51:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-104269\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-104269\nhttps://github.com/owasp-modsecurity/ModSecurity/commit/463db0c840fa27bfba095b0406a63004a12884b0\nhttps://github.com/owasp-modsecurity/ModSecurity/commit/c6bd53d2dd96766b3afdc35d9929ebb20925d13d\nhttps://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15\nhttps://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17\nhttps://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-5pww-8rfg-9crf"], "statement": "This flaw is rated as an Important severity impact because unauthenticated remote attackers can evade web application firewall inspection controls, exposing protected downstream services to malicious file payloads. In environments where ModSecurity acts as a reverse proxy or web server filter in front of backend applications such as Java, Python, Node.js, or Go, parameter interpretation discrepancies allow incoming requests to specify an innocuous filename for the filter while delivering an alternate name to the backend. The security risk is heightened when backend services rely on the firewall to enforce file upload restrictions, whereas backends handling multipart payloads through parsers immune to this parameter precedence variation remain unaffected.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0,3.0.17)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "ModSecurity", "source": "cna", "vendor": "owasp-modsecurity"}, "product": "modsecurity", "vendor": "modsecurity"}], "created": "2026-11-05T17:30:19.912125+00:00", "updated": "2026-11-06T13:30:05.091005+00:00", "vendors": ["modsecurity", "modsecurity$PRODUCT$modsecurity"]}