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EulerOS 2.0 SP13 : python-filelock (EulerOS-SA-2026-4093)
medium Nessus Plugin ID 364889
Synopsis
The remote EulerOS host is missing a security update.Description
According to the versions of the python-filelock package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :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)
Tenable has extracted the preceding description block directly from the EulerOS python-filelock security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected python-filelock packages.See Also
Plugin Details
Severity: Medium
ID: 364889
File Name: EulerOS_SA-2026-4093.nasl
Version: 1.1
Type: Local
Family: Huawei Local Security Checks
Published: 10/12/2026
Updated: 10/12/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.5
Percentile: 57.51
CVSS v2
Risk Factor: Medium
Base Score: 5.7
Temporal Score: 4.5
Vector: CVSS2#AV:L/AC:H/Au:S/C:P/I:C/A:C
CVSS Score Source: CVE-2025-68146
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:python3-filelock
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp
Excluded KB Items: Host/EulerOS/uvp_version
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/10/2026
Vulnerability Publication Date: 12/16/2025
Reference Information
CVE: CVE-2025-68146