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.
Weakness
The product has a loop body or loop condition that contains a control element that directly or indirectly consumes platform resources, e.g. messaging, sessions, locks, or file descriptors.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Modsecurity | Owasp | * | 2.9.10 (excluding) |
| Red Hat Enterprise Linux 9 | RedHat | mod_security-0:2.9.6-2.el9_6.1 | * |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | RedHat | mod_security-0:2.9.3-12.el9_0.2 | * |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | RedHat | mod_security-0:2.9.6-1.el9_2.2 | * |
| Red Hat Enterprise Linux 9.4 Extended Update Support | RedHat | mod_security-0:2.9.6-1.el9_4.2 | * |
| Modsecurity-apache | Ubuntu | esm-apps/bionic | * |
| Modsecurity-apache | Ubuntu | esm-apps/focal | * |
| Modsecurity-apache | Ubuntu | esm-apps/jammy | * |
| Modsecurity-apache | Ubuntu | esm-apps/noble | * |
| Modsecurity-apache | Ubuntu | esm-apps/xenial | * |
| Modsecurity-apache | Ubuntu | esm-infra-legacy/trusty | * |
| Modsecurity-apache | Ubuntu | focal | * |
| Modsecurity-apache | Ubuntu | jammy | * |
| Modsecurity-apache | Ubuntu | noble | * |
| Modsecurity-apache | Ubuntu | oracular | * |
| Modsecurity-apache | Ubuntu | plucky | * |
| Modsecurity-apache | Ubuntu | upstream | * |
Extended Description
References
- https://github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb78d60c5e90b53ca2e
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2w
- https://github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)#sanitisearg
- https://lists.debian.org/debian-lts-announce/2025/06/msg00009.html