← Vulnerability feed

Vulnerability record · CVE-2026-52761 · published 10 July 2026

CVE-2026-52761: Owasp modsecurity vulnerability

Owasp · Modsecurity

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.

5.3 CVSS 3.1 Medium EPSS 0.41% · top 67.3% CWE-467 · CWE-467
5.3CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
14 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4 Patch
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16 ProductRelease Notes
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qq Vendor Advisory

Track CVE-2026-52761 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.6CVE-2026-52747Owasp modsecurity vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-da…EPSS 0.48%8.6CVE-2024-1019Owasp modsecurity improper input validation vulnerabilityModSecurity / libModSecurity 3.0.0 to 3.0.11 is affected by a WAF bypass for path-based payloads submitted via specially crafted request URLs. ModSec…EPSS 0.69%8.2CVE-2026-42268Owasp modsecurity vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is …EPSS 0.49%8.2CVE-2026-30923Owasp modsecurity out-of-bounds read vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the…EPSS 0.52%7.5CVE-2025-48866Owasp modsecurity vulnerabilityModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a den…EPSS 0.83%7.5CVE-2023-38285Owasp modsecurity vulnerabilityTrustwave ModSecurity 3.x before 3.0.10 has Inefficient Algorithmic Complexity.EPSS 0.90%7.5CVE-2023-28882Owasp modsecurity uncontrolled resource consumption vulnerabilityTrustwave ModSecurity 3.0.5 through 3.0.8 before 3.0.9 allows a denial of service (worker crash and unresponsiveness) because some inputs cause a seg…EPSS 0.73%7.5CVE-2022-48279Owasp modsecurity interpretation conflict vulnerabilityIn ModSecurity before 2.9.6 and 3.x before 3.0.8, HTTP multipart requests were incorrectly parsed and could bypass the Web Application Firewall. NOTE…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2026-52761), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.