What is CVE-2026-42268?

CVE-2026-42268 is a high-severity vulnerability in Owasp Modsecurity, classified under Integer Underflow. CVSS score: 7.5/10. Published 2026-05-12.

How severe is CVE-2026-42268?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Owasp Modsecurity

CVE-2026-42268

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmods…

EPSS: 0.001 (16.7th 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 >= 3.0.0, < 3.0.15

Weakness classification (CWE)

CWE-191 — Integer Underflow
CWE-248

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42268?: CVE-2026-42268 is a high-severity vulnerability in Owasp Modsecurity, classified under Integer Underflow. CVSS score: 7.5/10. Published 2026-05-12.
How severe is CVE-2026-42268?: High severity. CVSS v3 base score is 7.5 out of 10.