UBUNTU-CVE-2026-30923

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Source
https://ubuntu.com/security/CVE-2026-30923
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-30923
Upstream
Published
2026-05-05T19:16:00Z
Modified
2026-05-20T16:12:05.767933789Z
Severity
  • 8.2 (High) CVSS_V4 - 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 CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.

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
0Unknown 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_version": "3.0.4-1build1",
            "binary_name": "libmodsecurity3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json"

Ubuntu:22.04:LTS / modsecurity

Package

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

Affected ranges

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

Affected versions

3.*
3.0.4-2
3.0.6-1

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json"

Ubuntu:24.04:LTS / modsecurity

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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_version": "3.0.12-1.1build2",
            "binary_name": "libmodsecurity3t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json"

Ubuntu:25.10 / modsecurity

Package

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

Affected ranges

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

Affected versions

3.*
3.0.13-1
3.0.14-1
3.0.14-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.14-1build1",
            "binary_name": "libmodsecurity3t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json"

Ubuntu:26.04:LTS / modsecurity

Package

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

Affected ranges

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

Affected versions

3.*
3.0.14-1build1
3.0.14-1build2

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-30923.json"