CVE-2026-30923
7.5 · HIGHOverview
CVE-2026-30923 is a high-severity vulnerability affecting owasp modsecurity. It was published on May 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.
Remediation
Check the references section for vendor advisories and patches from owasp. Update modsecurity to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| owasp | modsecurity | >= 0, < 3.0.15 | Affected |
Frequently Asked Questions
What is CVE-2026-30923?
CVE-2026-30923 is a high-severity vulnerability affecting owasp modsecurity. It was published on May 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-30923?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-30923?
Check the references section for vendor advisories and patches from owasp. Update modsecurity to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-30923?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-30923 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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