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CVE-2026-42268

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

8.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.40%Up 0.4 points since May 13, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

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

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.

Record
CVE-2026-42268
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-191, CWE-248
Updated
2026-11-02
EUVDEUVD-2026-29854 8.2

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.

Record
EUVD-2026-29854
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 8.2

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.

Record
CVE-2026-42268
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-191, CWE-248
Updated
2026-11-02
OSV 8.2

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

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.

Record
CVE-2026-42268
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-191, CWE-248
Updated
2026-11-02
OSVDEBIAN-CVE-2026-42268 7.5

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.

Record
DEBIAN-CVE-2026-42268
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42268 8.2

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.

Record
UBUNTU-CVE-2026-42268
CVSS 4.0
8.2 HighCVSS: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 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBIT-modsecurity-2026-42268 No score

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

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.

Record
BIT-modsecurity-2026-42268
Updated
2026-11-02
OSVBIT-modsecurity2-2026-42268 No score

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

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.

Record
BIT-modsecurity2-2026-42268
Updated
2026-11-02
OSVopenSUSE-SU-2026:10732-1 No score

libmodsecurity3-3.0.15-1.1 on GA media

These are all security issues fixed in the libmodsecurity3-3.0.15-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10732-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
modsecurity
Bitnami
 3.0.0 up to 3.0.15
3.0.15
modsecurity2
Bitnami
 3.0.0 up to 3.0.15
3.0.15
modsecurity
Debian:12
 before 3.0.9-1+deb12u2, plus listed versions
3.0.9-13.0.9-1+deb12u1
3.0.9-1+deb12u2
modsecurity
Debian:13
 before 3.0.14-1+deb13u1, plus listed versions
3.0.14-1
3.0.14-1+deb13u1
modsecurity
Debian:14
 before 3.0.15-1, plus listed versions
3.0.14-1
3.0.15-1
modsecurity
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.0.3-13.0.4-13.0.4-1build1
 None known
modsecurity
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.0.4-23.0.6-1
 None known
modsecurity
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.0.10-13.0.11-13.0.12-13.0.12-1.1build13.0.12-1.1build2
 None known
modsecurity
Ubuntu:25.10
 All versions, plus listed versions
3.0.13-13.0.14-13.0.14-1build1
 None known
modsecurity
Ubuntu:26.10
 All versions, plus listed versions
3.0.14-1build23.0.15-13.0.16-1
 None known
modsecurity
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.0.14-1build13.0.14-1build2
 None known
modsecurity
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 3.0.15-1.1
3.0.15-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42268 is a high vulnerability (CVSS 8.2) in Owasp Modsecurity, published May 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 33rd percentile. Fixed in modsecurity 3.0.15.

References

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