UBUNTU-CVE-2026-33691

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Source
https://ubuntu.com/security/CVE-2026-33691
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33691
Upstream
  • CVE-2026-33691
Published
2026-04-02T16:16:00Z
Modified
2026-04-13T12:52:47.038600Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.

References

Affected packages

Ubuntu:16.04:LTS
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@2.2.9-1?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.2.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "2.2.9-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"
Ubuntu:18.04:LTS
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@3.0.2-1?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.0.0-3
3.0.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "3.0.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"
Ubuntu:20.04:LTS
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@3.2.0-1?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.1.1-1
3.2.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "3.2.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"
Ubuntu:22.04:LTS
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@3.3.2-1?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.0-1
3.3.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "3.3.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"
Ubuntu:24.04:LTS
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@3.3.5-2?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.3.5-1
3.3.5-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "3.3.5-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"
Ubuntu:25.10
modsecurity-crs

Package

Name
modsecurity-crs
Purl
pkg:deb/ubuntu/modsecurity-crs@3.3.7-1?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.3.7-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "modsecurity-crs",
            "binary_version": "3.3.7-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33691.json"