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CVE-2026-42268: modsecurity vulnerability
CVE-2026-42268: high vulnerability affecting modsecurity. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 8.2 HIGH
- EPSS
- 32.2%
- Known exploited
- not in KEV
- Product
- modsecurity
What is known
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmodsecurity3 if the user (administrator) uses a rule any of @verifySSN, @verifyCPF, or @verifySVNR. This vulnerability is fixed in 3.0.15.
Business impact
Successful exploitation of CVE-2026-42268, a high vulnerability (CVSS 8.2) affecting modsecurity, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether modsecurity is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.