CVE-2025-48866 – ModSecurity SanitizeArg Denial of Service Vulnerability

CVE ID : CVE-2025-48866

Published : June 2, 2025, 4:15 p.m. | 1 hour, 25 minutes ago

Description : ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` – this is the same action but an alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service. Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the `sanitiseArg` (or `sanitizeArg`) action.

Severity: 7.5 | HIGH

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