UBUNTU-CVE-2026-42171

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Source
https://ubuntu.com/security/CVE-2026-42171
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-42171
Upstream
  • CVE-2026-42171
Published
2026-04-24T22:16:00Z
Modified
2026-05-20T16:25:42.989886686Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).

References

Affected packages

Ubuntu:16.04:LTS
nsis

Package

Name
nsis
Purl
pkg:deb/ubuntu/nsis?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.46-10.1
2.48-2
2.50-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "2.50-1"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "2.50-1"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "2.50-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:18.04:LTS
nsis

Package

Name
nsis
Purl
pkg:deb/ubuntu/nsis?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.51-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "2.51-1"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "2.51-1"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "2.51-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:20.04:LTS
nsis

Package

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

Affected ranges

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

Affected versions

3.*
3.04-1
3.04-2
3.05-1
3.05-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "3.05-2"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "3.05-2"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "3.05-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:22.04:LTS
nsis

Package

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

Affected ranges

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

Affected versions

3.*
3.06.1-1
3.08-1
3.08-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "3.08-2"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "3.08-2"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "3.08-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:24.04:LTS
nsis

Package

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

Affected ranges

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

Affected versions

3.*
3.09-1
3.09-2
3.09-3
3.09-4
3.09-4ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "3.09-4ubuntu1"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "3.09-4ubuntu1"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "3.09-4ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:25.10
nsis

Package

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

Affected ranges

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

Affected versions

3.*
3.10-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "3.10-2ubuntu1"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "3.10-2ubuntu1"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "3.10-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:26.04:LTS
nsis

Package

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

Affected ranges

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

Affected versions

3.*
3.10-2ubuntu1
3.10-2ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "3.10-2ubuntu2"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "3.10-2ubuntu2"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "3.10-2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"
Ubuntu:Pro:14.04:LTS
nsis

Package

Name
nsis
Purl
pkg:deb/ubuntu/nsis?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

2.*
2.46-7
2.46-7ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nsis",
            "binary_version": "2.46-7ubuntu0.1~esm1"
        },
        {
            "binary_name": "nsis-common",
            "binary_version": "2.46-7ubuntu0.1~esm1"
        },
        {
            "binary_name": "nsis-pluginapi",
            "binary_version": "2.46-7ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42171.json"