UBUNTU-CVE-2026-112908

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Source
https://ubuntu.com/security/CVE-2026-112908
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-112908
Upstream
Published
2026-11-06T00:00:00Z
Modified
2026-11-07T01:45:05Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

filelock is a platform-independent file lock for Python. From version 3.30.0 until version 4.2.1,  StrictSoftFileLock  and  AsyncStrictSoftFileLock  on POSIX systems create coordination and claim directories without applying the caller’s restrictive lock mode. A permissive umask or inherited default ACL can leave these directories writable by another local user, allowing that user to delete an active holder’s claims. Another authorized process can then acquire the lock while the original holder remains in its critical section. An attacker can also plant malformed claims to prevent acquisition. This issue is fixed in version 4.2.1.

References

Affected packages

Ubuntu:26.04:LTS
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.18.0-1
3.20.0-1
3.20.2-1
3.20.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.20.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"
Ubuntu:26.10
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=stonking

Affected ranges

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

Affected versions

3.*
3.20.3-1
3.29.4-1
3.32.0-1
3.32.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.32.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"
Ubuntu:Pro:18.04:LTS
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

2.*
2.0.11-1
2.0.12-1
2.0.13-1
3.*
3.0.0-2
3.0.3-1
3.0.4-1
3.0.4-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-filelock",
            "binary_version": "3.0.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.0.4-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"
Ubuntu:Pro:20.04:LTS
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

3.*
3.0.12-1
3.0.12-2
3.0.12-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.0.12-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"
Ubuntu:Pro:22.04:LTS
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.12-2
3.3.2-1
3.4.0-1
3.4.2-1
3.4.2-2
3.6.0-1
3.6.0-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.6.0-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"
Ubuntu:Pro:24.04:LTS
python-filelock

Package

Name
python-filelock
Purl
pkg:deb/ubuntu/python-filelock?arch=source&distro=esm-apps%2Fnoble

Affected ranges

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

Affected versions

3.*
3.12.2-1
3.12.4-1
3.13.1-1
3.13.1-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-filelock",
            "binary_version": "3.13.1-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-112908.json"