CVE-2026-42268

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{"bugzilla": {"description": "mod_security: ModSecurity: Denial of Service via unsigned integer underflow in rule verification functions", "id": "2476872", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2476872"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-191", "details": ["A flaw was found in ModSecurity, an open-source web application firewall (WAF). This vulnerability occurs when an administrator configures a rule that uses `@verifySSN`, `@verifyCPF`, or `@verifySVNR` functions. An unhandled exception, specifically an unsigned integer underflow, can lead to a denial of service (DoS) condition, making the WAF unavailable."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, administrators should avoid configuring ModSecurity rules that utilize the `@verifySSN`, `@verifyCPF`, or `@verifySVNR` functions. Disabling or removing these specific rules will prevent the unsigned integer underflow that leads to a denial of service. After modifying ModSecurity configuration, a service reload or restart may be required for the changes to take effect."}, "name": "CVE-2026-42268", "package_state": [{"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": "2026-05-12T21:40:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42268\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42268\nhttps://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w"], "threat_severity": "Moderate"}

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