OESA-2026-3143

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3143
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json
JSON Data
https://api.osv.dev/v1/vulns/OESA-2026-3143
Upstream
Published
2026-07-24T03:27:39Z
Modified
2026-07-24T03:45:18.713993424Z
Summary
python-filelock security update
Details

Security Fix(es):

filelock is a platform-independent file lock for Python. In versions prior to 3.20.1, a Time-of-Check-Time-of-Use (TOCTOU) race condition allows local attackers to corrupt or truncate arbitrary user files through symlink attacks. The vulnerability exists in both Unix and Windows lock file creation where filelock checks if a file exists before opening it with O_TRUNC. An attacker can create a symlink pointing to a victim file in the time gap between the check and open, causing os.open() to follow the symlink and truncate the target file. All users of filelock on Unix, Linux, macOS, and Windows systems are impacted. The vulnerability cascades to dependent libraries. The attack requires local filesystem access and ability to create symlinks (standard user permissions on Unix; Developer Mode on Windows 10+). Exploitation succeeds within 1-3 attempts when lock file paths are predictable. The issue is fixed in version 3.20.1. If immediate upgrade is not possible, use SoftFileLock instead of UnixFileLock/WindowsFileLock (note: different locking semantics, may not be suitable for all use cases); ensure lock file directories have restrictive permissions (chmod 0700) to prevent untrusted users from creating symlinks; and/or monitor lock file directories for suspicious symlinks before running trusted applications. These workarounds provide only partial mitigation. The race condition remains exploitable. Upgrading to version 3.20.1 is strongly recommended.(CVE-2025-68146)

Database specific 
{
    "severity": "Medium"
}
References

Affected packages

openEuler:20.03-LTS-SP4
python-filelock

Package

Name
python-filelock
Purl
pkg:rpm/openEuler/python-filelock&distro=openEuler-20.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.12-2.oe2003sp4

Ecosystem specific 

{
    "src": [
        "python-filelock-3.0.12-2.oe2003sp4.src.rpm"
    ],
    "noarch": [
        "python-filelock-doc-3.0.12-2.oe2003sp4.noarch.rpm",
        "python-filelock-help-3.0.12-2.oe2003sp4.noarch.rpm",
        "python3-filelock-3.0.12-2.oe2003sp4.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json"
openEuler:22.03-LTS-SP4
python-filelock

Package

Name
python-filelock
Purl
pkg:rpm/openEuler/python-filelock&distro=openEuler-22.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.12-4.oe2203sp4

Ecosystem specific 

{
    "src": [
        "python-filelock-3.0.12-4.oe2203sp4.src.rpm"
    ],
    "noarch": [
        "python-filelock-doc-3.0.12-4.oe2203sp4.noarch.rpm",
        "python-filelock-help-3.0.12-4.oe2203sp4.noarch.rpm",
        "python3-filelock-3.0.12-4.oe2203sp4.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json"
openEuler:24.03-LTS-SP1
python-filelock

Package

Name
python-filelock
Purl
pkg:rpm/openEuler/python-filelock&distro=openEuler-24.03-LTS-SP1

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.13.1-5.oe2403sp1

Ecosystem specific 

{
    "src": [
        "python-filelock-3.13.1-5.oe2403sp1.src.rpm"
    ],
    "noarch": [
        "python-filelock-doc-3.13.1-5.oe2403sp1.noarch.rpm",
        "python-filelock-help-3.13.1-5.oe2403sp1.noarch.rpm",
        "python3-filelock-3.13.1-5.oe2403sp1.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json"
openEuler:24.03-LTS-SP3
python-filelock

Package

Name
python-filelock
Purl
pkg:rpm/openEuler/python-filelock&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.13.1-5.oe2403sp3

Ecosystem specific 

{
    "src": [
        "python-filelock-3.13.1-5.oe2403sp3.src.rpm"
    ],
    "noarch": [
        "python-filelock-doc-3.13.1-5.oe2403sp3.noarch.rpm",
        "python-filelock-help-3.13.1-5.oe2403sp3.noarch.rpm",
        "python3-filelock-3.13.1-5.oe2403sp3.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json"
openEuler:24.03-LTS-SP4
python-filelock

Package

Name
python-filelock
Purl
pkg:rpm/openEuler/python-filelock&distro=openEuler-24.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.13.1-5.oe2403sp4

Ecosystem specific 

{
    "src": [
        "python-filelock-3.13.1-5.oe2403sp4.src.rpm"
    ],
    "noarch": [
        "python-filelock-doc-3.13.1-5.oe2403sp4.noarch.rpm",
        "python-filelock-help-3.13.1-5.oe2403sp4.noarch.rpm",
        "python3-filelock-3.13.1-5.oe2403sp4.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3143.json"