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.
CVE-2026-52761
MEDIUMPre-NVD 5.85.8
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 5.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
5.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: —CVSS: 5.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.8
- EG Score
- 5.8(low)
- EPSS
- —
- KEV
- Not listed
Published
July 10, 2026
Last Modified
July 10, 2026
Advisory Details (3)
Auto-updated Jul 10, 2026Patch available. Sources: github_release, github, github_commit.
github Patch Available
Transformation utf8toUnicode produces wrong output on i386 architecture · Advisory · owasp-modsecurity/ModSecurity · GitHub
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qjgm-7gp4-f8qqgithub_release Patch Available
v3.0.16
Patch available: owasp-modsecurity/ModSecurity v3.0.16
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16github_commit
commit edcd010814e2 (owasp-modsecurity/ModSecurity)
Fix landed in owasp-modsecurity/ModSecurity commit edcd010814e2 — awaiting tagged release
https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-11 20:40 UTCEG score recompute
- 2026-07-10 21:53 UTCEG score recompute
- 2026-07-10 21:52 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-52761?
CVE-2026-52761 is a medium vulnerability published on July 10, 2026. 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/utf8tounicode.cc produces wrong output on i386 architecture because snprintf uses sizeof on a…
When was CVE-2026-52761 disclosed?
CVE-2026-52761 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-52761?
CVE-2026-52761 has a CVSS v3 base score of 5.8 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-52761?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52761, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-52761
Is Your Infrastructure Affected by CVE-2026-52761?
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