Bug 2499254 (CVE-2026-52761) - CVE-2026-52761 ModSecurity: ModSecurity: Web Application Firewall rules bypass due to incorrect UTF-8 to Unicode transformation
Summary: CVE-2026-52761 ModSecurity: ModSecurity: Web Application Firewall rules bypas...
Keywords:
Status: NEW
Alias: CVE-2026-52761
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2499330 2499331 2499332 2499333
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-10 22:02 UTC by OSIDB Bzimport
Modified: 2026-07-11 07:34 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-10 22:02:19 UTC 
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.
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