CVE-2026-42268 PUBLISHED

ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	owasp-modsecurity
Product	ModSecurity
Versions	Version >= 3.0.0, < 3.0.15 is affected

References

https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w

Problem Types

CWE-191: Integer Underflow (Wrap or Wraparound) CWE
CWE-248: Uncaught Exception CWE