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CVE-2026-52761

ModSecurity: Transformation utf8toUnicode produces wrong output on i386 architecture

Published: Jul 10, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-467
5.8MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 66.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-467

Affected Products

owasp-modsecurity
oss-projectaka mod_security, modsecurity
ModSecurityOn-prem
Networking Infrastructure / firewall
owasp
oss-project·USaka modsecurity, modsecurity-crs, owasp modsecurity core rule set
modsecurityMixed
Networking Infrastructure / firewall

Exploitability

Official Patch Available

References

https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qq
github.com
https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4
github.com
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16
github.com
News mentions
1

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