# CVE-2025-48866

## Summary

- **CVE ID:** CVE-2025-48866
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-1050
- **Published:** Jun 2, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- owasp-modsecurity — ModSecurity (< 2.9.10)

## References

- [CNA](https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2w)
- [CNA](https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r)
- [CNA](https://github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb78d60c5e90b53ca2e)
- [CNA](https://github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)#sanitisearg)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/06/msg00009.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.83%
- **EPSS Percentile:** 55.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._