Bug 2369827 (CVE-2025-48866)

Summary:	CVE-2025-48866 mod_security: ModSecurity Denial of Service Vulnerability
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	csutherl, jclere, mturk, pjindal, plodge, szappis
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A denial of service flaw was found in ModSecurity. This vulnerability is present in the `sanitiseArg`/`sanitizeArg` function can be overloaded with a large number of arguments which will lead to excessive memory usage when processing json values. This may lead to a denial of service in the affected web server should memory limits be exceeded.	Story Points:	---
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Last Closed:		Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2369879, 2369880
Bug Blocks:

Description OSIDB Bzimport 2025-06-02 16:01:19 UTC

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.