Out-of-bounds Read in Owasp Modsecurity
CVE-2026-30923
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 tra…
Vulnerability class: Buffer Overflow
EPSS: 0.004 (35.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Owasp Modsecurity
- Owasp-modsecurity Modsecurity — versions < 3.0.15
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Product, Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-30923?
- CVE-2026-30923 is a high-severity vulnerability in Owasp Modsecurity, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-05-05.
- How severe is CVE-2026-30923?
- High severity. CVSS v3 base score is 7.5 out of 10.