CVE-2026-42268— ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: ModSecurity
- CVE-2026-30923
libModSecurity3 denial of service via segfault when using t: - CVE-2025-54571
ModSecurity's Insufficient Return Value Handling can Lead to - CVE-2025-52891
ModSecurity empty XML tag causes segmentation fault - CVE-2025-48866
ModSecurity has possible DoS vulnerability in sanitiseArg ac - CVE-2025-47947
ModSecurity Has Possible DoS Vulnerability
Same vendor: owasp-modsecurity
- CVE-2026-30923
libModSecurity3 denial of service via segfault when using t: - CVE-2025-54571
ModSecurity's Insufficient Return Value Handling can Lead to - CVE-2025-52891
ModSecurity empty XML tag causes segmentation fault - CVE-2025-48866
ModSecurity has possible DoS vulnerability in sanitiseArg ac - CVE-2025-47947
ModSecurity Has Possible DoS Vulnerability
Same weakness: CWE-191
- CVE-2026-34672
CAI Content Credentials | Integer Underflow (Wrap or Wraparo - CVE-2026-34667
CAI Content Credentials | Integer Underflow (Wrap or Wraparo - CVE-2026-40397
Windows Common Log File System Driver Elevation of Privilege - CVE-2026-7736
osrg GoBGP mrt.go parseRibEntry integer underflow - CVE-2026-33845
Gnutls: gnutls: denial of service via dtls zero-length fragm
V. Comments for CVE-2026-42268
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