Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Owasp | Modsecurity | < 2.9.10 |
Related Weaknesses (CWE)
References
- https://github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb7Patch
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vNot Applicable
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8ExploitVendor Advisory
- https://github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)#saProduct
- https://lists.debian.org/debian-lts-announce/2025/06/msg00009.htmlMailing List
FAQ
What is CVE-2025-48866?
CVE-2025-48866 is a vulnerability with a CVSS score of 7.5 (HIGH). 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-v...
How severe is CVE-2025-48866?
CVE-2025-48866 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-48866?
Check the references section above for vendor advisories and patch information. Affected products include: Owasp Modsecurity.