CVE-2026-52761

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{"bugzilla": {"description": "ModSecurity: ModSecurity: Web Application Firewall rules bypass due to incorrect UTF-8 to Unicode transformation", "id": "2499254", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499254"}, "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-131", "details": ["A flaw was found in ModSecurity, an open-source web application firewall (WAF). The `t:utf8toUnicode` transformation function, responsible for converting UTF-8 encoded characters to Unicode, generates incorrect output on i386 architectures. This vulnerability allows an attacker to bypass WAF rules, potentially enabling malicious requests to reach the protected application. The consequence is a moderate integrity loss due to the circumvention of security controls."], "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-2026-52761", "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": "2026-07-10T21:40:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52761\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52761\nhttps://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4\nhttps://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16\nhttps://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qq"], "statement": "Conditions for Exploitation: Exploitation is strictly limited to 32-bit (i386) architectures, which reduces the likelihood of exploitation in typical deployments. Furthermore, it requires the ModSecurity configuration to actively use rules that rely on the affected transformation function.\nImpact Limitations: The vulnerability functions solely as a WAF rule bypass and 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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