ModSecurity: Transformation utf8toUnicode produces wrong output on i386 architecture

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Summary

CVECVE-2026-52761
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 22:16:42 UTC
Updated2026-07-10 22:16:42 UTC
DescriptionModSecurity 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.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Problem Types: CWE-467 | CWE-467 CWE-467: Use of sizeof() on a Pointer Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Owasp-modsecurity ModSecurity affected >= 3.0.0, < 3.0.16 Not specified

References

ReferenceSourceLinkTags
github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7... [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a... [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16 [email protected] github.com
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