CVE catalog

CVE-2025-48866

ModSecurity vulnerabilities

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jun 2, 2025, 3:46:19 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.83% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	modsecurity-apache	sid	`2.9.13-1`	fixed
Debian	modsecurity-apache	forky	`2.9.13-1`	fixed
Debian	modsecurity-apache	trixie	`2.9.11-1+deb13u1`	fixed
Debian	modsecurity-apache	bookworm	`2.9.7-1+deb12u2`	fixed
Debian	modsecurity-apache	bookworm-security	`2.9.7-1+deb12u1`	fixed
Ubuntu	modsecurity-apache	noble	`2.9.7-1ubuntu0.24.04.1~esm1`	fixed
Ubuntu	libapache2-mod-security2	noble	`2.9.7-1ubuntu0.24.04.1~esm1`	fixed
Ubuntu	modsecurity-apache	pro	`2.9.7-1`	vulnerable
Ubuntu	modsecurity-apache	pro	`2.9.7-1build2`	vulnerable
Ubuntu	modsecurity-apache	pro	`2.9.7-1build3`	vulnerable
Ubuntu	modsecurity-apache	pro	`2.9.7-1ubuntu0.24.04.1~esm1`	fixed
Ubuntu	modsecurity-apache	25.10	`2.9.8-1.1`	vulnerable
Ubuntu	modsecurity-apache	25.10	`2.9.9-1`	vulnerable
Ubuntu	modsecurity-apache	25.10	`2.9.9-1ubuntu1`	vulnerable
Ubuntu	modsecurity-apache	25.10	`2.9.12-2`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	modsecurity-apache	source	sid	`2.9.10-1`	not yet assigned	Not reported	[1107196]
Debian	modsecurity-apache	source	forky	`2.9.10-1`	not yet assigned	Not reported	[1107196]
Debian	modsecurity-apache	source	trixie	`2.9.10-1`	not yet assigned	Not reported	[1107196]
Debian	modsecurity-apache	source	bookworm	`2.9.7-1+deb12u1`	not yet assigned	Not reported	[1107196]
Ubuntu	modsecurity-apache	deb	noble	`2.9.7-1ubuntu0.24.04.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	libapache2-mod-security2	deb	noble	`2.9.7-1ubuntu0.24.04.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	modsecurity-apache	deb	pro	`2.9.7-1ubuntu0.24.04.1~esm1`	Not reported	UBUNTU-CVE-2025-48866	Not reported

[Debian bug #1107196]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libapache2-mod-security2]Fixed
Source package: [modsecurity-apache]
Details (4)
- 2.9.7-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.9.7-1+deb12u1
  usn · modsecurity-apache · debian · bookworm; usn · modsecurity-apache · debian · 12
- 2.9.7-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.9.7-1+deb12u1
  usn · modsecurity-apache · debian · bookworm; usn · modsecurity-apache · debian · 12
- 2.9.7-1+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 2.9.7-1+deb12u1
  usn · modsecurity-apache · debian · bookworm; usn · modsecurity-apache · debian · 12
- 2.9.7-1+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 2.9.7-1+deb12u1
  usn · modsecurity-apache · debian · bookworm; usn · modsecurity-apache · debian · 12

[Debian 13 (Trixie)]

[libapache2-mod-security2]Fixed
Source package: [modsecurity-apache]
Details (2)
- 2.9.11-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.9.10-1
  usn · modsecurity-apache · debian · 13
- 2.9.11-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.9.10-1
  usn · modsecurity-apache · debian · 13

Observed: Oct 24, 2026, 10:03:53 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]