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CVE-2026-42268

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

Published: May 12, 2026Updated: May 14, 2026 Sources: CVE List NVDCWE-191
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 68.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-191CWE-248

Affected Products

ModSecurityowasp-modsecurity
On-prem
Networking Infrastructure / firewall
modsecurityowasp
Mixed
Networking Infrastructure / firewall
owasp-modsecurityoss-projectNetworking Infrastructureaka modsecurity, mod_security
owasposs-projectUSNetworking Infrastructureaka owasp modsecurity core rule set, modsecurity, modsecurity-crs

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

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

Timeline

Published
May 12, 2026
Last Updated
May 14, 2026

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