Vulnerability Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 through 3.0.15, the t:utf8toUnicode transformation in src/actions/transformations/utf8_to_unicode.cc produces wrong output on i386 architecture because snprintf uses sizeof on a char pointer rather than the length of the unicode buffer, allowing rules that use this transformation to be bypassed on i386 architecture. This issue is fixed in version 3.0.16.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Owasp | Modsecurity | >= 3.0.0, <= 3.0.15 |
Related Weaknesses (CWE)
References
- https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55aPatch
- https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16ProductRelease Notes
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7Vendor Advisory
FAQ
What is CVE-2026-52761?
CVE-2026-52761 is a vulnerability with a CVSS score of 5.8 (MEDIUM). ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 through 3.0.15, the t:utf8toUnicode transformation in src/actions/transformati...
How severe is CVE-2026-52761?
CVE-2026-52761 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52761?
Check the references section above for vendor advisories and patch information. Affected products include: Owasp Modsecurity.