CVE-2026-52761

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. 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: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
Patch 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-f8qq
github_release Patch Available

v3.0.16

Patch available: owasp-modsecurity/ModSecurity v3.0.16

https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16
github_commit

commit edcd010814e2 (owasp-modsecurity/ModSecurity)

Fix landed in owasp-modsecurity/ModSecurity commit edcd010814e2 — awaiting tagged release

https://github.com/owasp-modsecurity/ModSecurity/commit/edcd010814e234d46e2ec55a0f1078ff9d3032e4

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
modsecurity3.0.10-1 ... 3.0.9-1 (15 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
modsecurity3.0.10-1 ... 3.0.9-1+deb12u2 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
modsecurity3.0.14-1, 3.0.14-1+deb13u1, 3.0.15-1, 3.0.16-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
modsecurity3.0.14-1, 3.0.15-13.0.16-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:16 UTCEG score recompute
  3. 2026-09-16 14:08 UTCEPSS rescore
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  1. 2026-08-27 01:41 UTCEG score recompute
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  26. 2026-08-12 15:43 UTCEG score recompute
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  30. 2026-08-09 19:21 UTCEG score recompute
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  71. 2026-07-15 02:00 UTCEPSS rescore
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  73. 2026-07-14 20:04 UTCNVD updateCVSS v3 → 5.3
  74. 2026-07-13 22:31 UTCEPSS rescore
  75. 2026-07-13 06:13 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

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, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52761 actively exploited?
CVE-2026-52761 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.0% of all scored CVEs.
What is the CVSS score of CVE-2026-52761?
CVE-2026-52761 has a CVSS v3 base score of 5.3 (NVD).
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

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