What is CVE-2026-52761?

CVE-2026-52761 is a medium-severity vulnerability in Owasp Modsecurity, classified under CWE-467. CVSS score: 5.8/10. Published 2026-07-10.

How severe is CVE-2026-52761?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Owasp Modsecurity

CVE-2026-52761

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.

Published 2026-07-10 · last modified 2026-07-14.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.3th percentile), scored 2026-10-12.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Owasp Modsecurity
Owasp-Modsecurity Modsecurity — versions >= 3.0.0, < 3.0.16

Weakness classification (CWE)

CWE-467

References

github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qq (Vendor Advisory)
github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078f… (Patch)
github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-52761?: CVE-2026-52761 is a medium-severity vulnerability in Owasp Modsecurity, classified under CWE-467. CVSS score: 5.8/10. Published 2026-07-10.
How severe is CVE-2026-52761?: Medium severity. CVSS v3 base score is 5.8 out of 10.