# CVE-2025-48866: libapache2-mod-security2: ModSecurity is an open source, cross platform web application firewall(WAF) engine for Apache, IIS and Nginx CVE-2025-48866 is fixed in 8 products on 1 platform, first by libapache2-mod-security2 2.9.2-1ubuntu0.1~esm2, released June 2, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-48866 - Priority: High - CVSS: 7.5 (Medium) - EPSS: 0.0087 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 2, 2025 ## 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 adenial of service vulnerability similar toGHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` -this is the same action but an alias) is vulnerable to adding an excessivenumber of arguments, thereby leading to denial of service. Version 2.9.10fixes the issue. As a workaround, avoid using rules that contain the`sanitiseArg` (or `sanitizeArg`) action. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apache2-mod_security2 opensuse-leap 15.6 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | apache2-mod_security2 sles 15.6 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | apache2-mod_security2 sles 15.7 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | libapache2-mod-security2 Ubuntu 18.04.6 LTS (bionic) | 2.9.2-1ubuntu0.1~esm2 | [libapache2-mod-security2 2.9.2-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libapache2-mod-security2-2.9.2-1ubuntu0.1-esm2.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 20.04 LTS (focal) | 2.9.3-1ubuntu0.1+esm1 | [libapache2-mod-security2 2.9.3-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libapache2-mod-security2-2.9.3-1ubuntu0.1-esm1.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 22.04.1 LTS (jammy) | 2.9.5-1ubuntu0.1~esm2 | [libapache2-mod-security2 2.9.5-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libapache2-mod-security2-2.9.5-1ubuntu0.1-esm2.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 24.04.5 LTS (noble) | 2.9.7-1ubuntu0.24.04.1~esm1 | [libapache2-mod-security2 2.9.7-1ubuntu0.24.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapache2-mod-security2-2.9.7-1ubuntu0.24.04.1-esm1.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 24.10 (oracular) | 2.9.7-1ubuntu0.24.10.1 | [libapache2-mod-security2 2.9.7-1ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libapache2-mod-security2-2.9.7-1ubuntu0.24.10.1.md) | Jan 16, 2026 | | Linux | libapache2-mod-security2 Ubuntu 25.04 (plucky) | 2.9.8-1.1ubuntu0.1 | [libapache2-mod-security2 2.9.8-1.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libapache2-mod-security2-2.9.8-1.1ubuntu0.1.md) | Jan 16, 2026 | | Linux | mod_security RHEL 9 | 0:2.9.6-2.el9_6.1 | [RHSA-2025:12838](https://patchblox.com/security/data/fix/linux/rhsa-2025-12838.md) | Aug 5, 2025 | | Linux | mod_security amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security ol 9 | 0:2.9.6-2.el9_6.1 | [ELSA-2025-12838](https://patchblox.com/security/data/fix/linux/elsa-2025-12838.md) | Aug 5, 2025 | | Linux | mod_security rocky 9 | 0:2.9.6-2.el9_6.1 | [RLSA-2025:12838](https://patchblox.com/security/data/fix/linux/rlsa-2025-12838.md) | Oct 4, 2025 | | Linux | mod_security-debuginfo amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-debugsource amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-mlogc RHEL 9 | 0:2.9.6-2.el9_6.1 | [RHSA-2025:12838](https://patchblox.com/security/data/fix/linux/rhsa-2025-12838.md) | Aug 5, 2025 | | Linux | mod_security-mlogc amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-mlogc ol 9 | 0:2.9.6-2.el9_6.1 | [ELSA-2025-12838](https://patchblox.com/security/data/fix/linux/elsa-2025-12838.md) | Aug 5, 2025 | | Linux | mod_security-mlogc-debuginfo amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | modsecurity-apache Debian 11.6 (bullseye) | 2.9.3-3+deb11u4 | [DLA-4212-1](https://patchblox.com/security/data/fix/linux/dla-4212-1.md) | Jun 9, 2025 | | Linux | modsecurity-apache Debian 12.15 (bookworm) | 2.9.7-1+deb12u1 | [DEBIAN-CVE-2025-48866](https://patchblox.com/security/data/fix/linux/debian-cve-2025-48866.md) | Jun 2, 2025 | | Linux | modsecurity-apache Debian 13.5 (trixie) | 2.9.10-1 | [DEBIAN-CVE-2025-48866](https://patchblox.com/security/data/fix/linux/debian-cve-2025-48866.md) | Jun 2, 2025 | | Linux | modsecurity-apache Debian 14 | 2.9.10-1 | [DEBIAN-CVE-2025-48866](https://patchblox.com/security/data/fix/linux/debian-cve-2025-48866.md) | Jun 2, 2025 | --- Data as of 2026-11-08T00:53:09Z UTC. 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