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CVE-2026-42268— ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators

Quick assessment

Affected
owasp-modsecurity ModSecurity
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Modsecurity是OWASP ModSecurity开源的一个Web流量安全处理库。 ModSecurity 3.0.0版本至3.0.15之前版本存在数字错误漏洞，该漏洞源于无符号整数下溢导致未处理异常，可能导致使用特定规则时崩溃。

AI Predicted 5.5 Difficulty: Easy EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
owasp-modsecurity ModSecurity >= 3.0.0, < 3.0.15 affected
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I. Basic Information for CVE-2026-42268

Vulnerability Information
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Vulnerability Title
ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators
Source: CVE Program / CVE List V5
Vulnerability Description
ModSecurity 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 an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmodsecurity3 if the user (administrator) uses a rule any of @verifySSN, @verifyCPF, or @verifySVNR. This vulnerability is fixed in 3.0.15.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
Modsecurity 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Modsecurity是OWASP ModSecurity开源的一个Web流量安全处理库。 ModSecurity 3.0.0版本至3.0.15之前版本存在数字错误漏洞，该漏洞源于无符号整数下溢导致未处理异常，可能导致使用特定规则时崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
owasp-modsecurity ModSecurity >= 3.0.0, < 3.0.15 -

II. Public POCs for CVE-2026-42268

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III. Intelligence Information for CVE-2026-42268

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Vendor Advisories for CVE-2026-42268 (1)

IV. Related Vulnerabilities

Same product: ModSecurity
Same vendor: owasp-modsecurity
Same weakness: CWE-191

V. Comments for CVE-2026-42268

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