UBUNTU-CVE-2026-52761

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Source
https://ubuntu.com/security/CVE-2026-52761
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52761.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-52761
Upstream
Published
2026-07-10T22:16:00Z
Modified
2026-07-15T19:48:21Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 through 3.0.15, the t:utf8toUnicode transformation in src/actions/transformations/utf8_to_unicode.cc produces wrong output on i386 architecture because snprintf uses sizeof on a char pointer rather than the length of the unicode buffer, allowing rules that use this transformation to be bypassed on i386 architecture. This issue is fixed in version 3.0.16.

References

Affected packages

Ubuntu:20.04:LTS / modsecurity

Package

Name
modsecurity
Purl
pkg:deb/ubuntu/modsecurity?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.3-1
3.0.4-1
3.0.4-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libmodsecurity3",
            "binary_version": "3.0.4-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52761.json"

Ubuntu:22.04:LTS / modsecurity

Package

Name
modsecurity
Purl
pkg:deb/ubuntu/modsecurity?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.4-2
3.0.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libmodsecurity3",
            "binary_version": "3.0.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52761.json"

Ubuntu:24.04:LTS / modsecurity

Package

Name
modsecurity
Purl
pkg:deb/ubuntu/modsecurity?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.10-1
3.0.11-1
3.0.12-1
3.0.12-1.1build1
3.0.12-1.1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libmodsecurity3t64",
            "binary_version": "3.0.12-1.1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52761.json"

Ubuntu:26.04:LTS / modsecurity

Package

Name
modsecurity
Purl
pkg:deb/ubuntu/modsecurity?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.14-1build1
3.0.14-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libmodsecurity3t64",
            "binary_version": "3.0.14-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52761.json"