Medium 5.3Published Jul 10, 2026

CVE-2026-52761ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx.

Updated under an hour ago (2026-10-19 08:23 UTC)

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It affects owasp modsecurity. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for owasp modsecurity

Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-467
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

owasp modsecurity owasp:modsecurity	from 3.0.0 through 3.0.15	NVD

References

https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4patch
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16product, release-notes
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qqvendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.