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Vulnerability record · CVE-2025-48866 · published 2 June 2025

CVE-2025-48866: Owasp modsecurity vulnerability

Owasp · Modsecurity

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.

7.5 CVSS 3.1 High EPSS 0.83% · top 44.1% CWE-1050 · CWE-1050
7.5CVSS 3.1 base score
0.83%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb78d60c5e90b53ca2e Patch
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r Not Applicable
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2w ExploitVendor Advisory
https://github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)#sanitisearg Product
https://lists.debian.org/debian-lts-announce/2025/06/msg00009.html Mailing List

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.6CVE-2026-52747Owasp modsecurity vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-da…EPSS 0.48%8.6CVE-2024-1019Owasp modsecurity improper input validation vulnerabilityModSecurity / libModSecurity 3.0.0 to 3.0.11 is affected by a WAF bypass for path-based payloads submitted via specially crafted request URLs. ModSec…EPSS 0.69%8.2CVE-2026-42268Owasp modsecurity vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is …EPSS 0.49%8.2CVE-2026-30923Owasp modsecurity out-of-bounds read vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the…EPSS 0.52%7.5CVE-2023-38285Owasp modsecurity vulnerabilityTrustwave ModSecurity 3.x before 3.0.10 has Inefficient Algorithmic Complexity.EPSS 0.90%7.5CVE-2023-28882Owasp modsecurity uncontrolled resource consumption vulnerabilityTrustwave ModSecurity 3.0.5 through 3.0.8 before 3.0.9 allows a denial of service (worker crash and unresponsiveness) because some inputs cause a seg…EPSS 0.73%7.5CVE-2022-48279Owasp modsecurity interpretation conflict vulnerabilityIn ModSecurity before 2.9.6 and 3.x before 3.0.8, HTTP multipart requests were incorrectly parsed and could bypass the Web Application Firewall. NOTE…EPSS 1.2%7.5CVE-2021-42717Owasp modsecurity vulnerabilityModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in th…EPSS 3.1%

Source: NIST National Vulnerability Database (record CVE-2025-48866), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.