UBUNTU-CVE-2026-42563

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Source
https://ubuntu.com/security/CVE-2026-42563
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-42563
Upstream
Published
2026-06-10T23:16:00Z
Modified
2026-06-17T06:31:21.128039524Z
Severity
  • 7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.24.0 and prior to version 1.2.5, Dulwich's ProcessMergeDriver substitutes the file path (from the git tree, controllable by an attacker via a malicious branch) into the merge driver command via the %P placeholder and executes it with subprocess.run(..., shell=True). An attacker who can cause a victim to merge an untrusted branch can achieve arbitrary command execution by crafting malicious file paths. Version 1.2.5 fixes the issue.

References

Affected packages

Ubuntu:16.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.11.2-1ubuntu1
0.12.0-1
0.12.0-1build1
0.12.0-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.12.0-1build2"
        },
        {
            "binary_name": "python-dulwich",
            "binary_version": "0.12.0-1build2"
        },
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.12.0-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:18.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.18.2-1build1
0.18.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.18.5-1"
        },
        {
            "binary_name": "python-dulwich",
            "binary_version": "0.18.5-1"
        },
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.18.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:20.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.19.11-2
0.19.14-4ubuntu1
0.19.15-1
0.19.15-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pypy-dulwich",
            "binary_version": "0.19.15-1build1"
        },
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.19.15-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:22.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.20.15-1ubuntu1
0.20.31-1ubuntu1
0.20.31-1.1
0.20.31-1.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.20.31-1.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:24.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.21.6-1
0.21.6-1build1
0.21.6-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.21.6-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:25.10
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.22.7-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-dulwich",
            "binary_version": "0.22.7-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"
Ubuntu:26.04:LTS
dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.22.7-1
0.24.2-2
1.*
1.1.0-2ubuntu1
1.1.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-dulwich",
            "binary_version": "1.1.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42563.json"