UBUNTU-CVE-2025-48945

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2025-48945
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-48945
Upstream
Published
2025-06-20T20:15:00Z
Modified
2026-05-20T16:23:32Z
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
  • Ubuntu - medium
Summary
[none]
Details

pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.

References

Affected packages

Ubuntu:18.04:LTS
pycares

Package

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

Affected ranges

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

Affected versions

2.*
2.1.1-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-pycares",
            "binary_version": "2.1.1-2build2"
        },
        {
            "binary_name": "python3-pycares",
            "binary_version": "2.1.1-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"
Ubuntu:20.04:LTS
pycares

Package

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

Affected ranges

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

Affected versions

2.*
2.1.1-2build4
2.1.1-2build5
2.1.1-2.1
3.*
3.1.0-3
3.1.0-4
3.1.1-1
3.1.1-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-pycares",
            "binary_version": "3.1.1-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"
Ubuntu:22.04:LTS
pycares

Package

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

Affected ranges

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

Affected versions

3.*
3.1.1-1build3
3.1.1-1build5
4.*
4.1.2-2
4.1.2-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-pycares",
            "binary_version": "4.1.2-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"
Ubuntu:24.04:LTS
pycares

Package

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

Affected ranges

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

Affected versions

4.*
4.3.0-2
4.3.0-2build1
4.4.0-1
4.4.0-1build1
4.4.0-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-pycares",
            "binary_version": "4.4.0-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"
Ubuntu:25.10
pycares

Package

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

Affected ranges

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

Affected versions

4.*
4.4.0-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-pycares",
            "binary_version": "4.4.0-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"
Ubuntu:26.04:LTS
pycares

Package

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

Affected ranges

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

Affected versions

4.*
4.4.0-2build2
4.4.0-2build3
4.9.0-1
5.*
5.0.0-2
5.0.1-2
5.0.1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-pycares",
            "binary_version": "5.0.1-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-48945.json"