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ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade modsecurityUpgrade modsecurity-apache | Dec 20, 2021 | Dec 7, 2021 |
| Huawei Euleros 2_0_sp5 | — | Upgrade mod_security | Mar 22, 2022 | Dec 7, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade mod_security | Mar 29, 2022 | Dec 7, 2021 |
| Oracle Solaris | — | Upgrade web/server/apache-24/module/apache-security to version 2.9.5-11.4.42.0.1.113.0 on Solaris 11.4 | Feb 17, 2022 | Dec 7, 2021 |
| Suse | — | Upgrade modsecurity-develUpgrade libmodsecurity3-64bitUpgrade modsecurityUpgrade libmodsecurity3-32bitUpgrade libmodsecurity3 | Aug 9, 2024 | Dec 7, 2021 |
| Ubuntu | — | Upgrade libapache2-modsecurity (Ubuntu Pro)Upgrade libapache2-mod-security2Upgrade libapache2-mod-security2 (Ubuntu Pro) | Sep 18, 2023 | Dec 7, 2021 |
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