Vulnerability details

CVE-2026-42268

owasp-modsecurity ModSecurity

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

CVSS 4.0

8.2High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.2High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
owasp-modsecurity	ModSecurity	>= 3.0.0, < 3.0.15	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-05-13
Last updated: 2026-05-14
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.39%

Probability of exploitation in 30 days

33.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

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