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Python CVE-2026-22701

MEDIUM
Improper Link Resolution Before File Access (CWE-59)
2026-01-10 security-advisories@github.com GHSA-qmgc-5h2g-mvrw
Python Denial Of Service Race Condition Filelock Red Hat Suse
5.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
5.3 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Mar 05, 2026 - 13:50 nvd
Patch available
CVE Published
Jan 10, 2026 - 06:15 nvd
MEDIUM 5.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 42 pypi packages depend on filelock (19 direct, 23 indirect)

Ecosystem-wide dependent count for version 3.20.3.

DescriptionGitHub Advisory

filelock is a platform-independent file lock for Python. Prior to version 3.20.3, a TOCTOU race condition vulnerability exists in the SoftFileLock implementation of the filelock package. An attacker with local filesystem access and permission to create symlinks can exploit a race condition between the permission validation and file creation to cause lock operations to fail or behave unexpectedly. The vulnerability occurs in the _acquire() method between raise_on_not_writable_file() (permission check) and os.open() (file creation). During this race window, an attacker can create a symlink at the lock file path, potentially causing the lock to operate on an unintended target file or leading to denial of service. This issue has been patched in version 3.20.3.

AnalysisAI

Python's filelock SoftFileLock implementation prior to version 3.20.3 contains a TOCTOU race condition that allows local attackers with symlink creation privileges to interfere with lock file operations between permission validation and file creation. An attacker can exploit this window to create a symlink at the target lock path, causing lock operations to fail or redirect to unintended files, resulting in denial of service or unexpected behavior. Upgrade to filelock version 3.20.3 or later to remediate this vulnerability.

Technical ContextAI

This vulnerability (CWE-59: Improper Link Resolution Before File Access) affects Filelock. filelock is a platform-independent file lock for Python. Prior to version 3.20.3, a TOCTOU race condition vulnerability exists in the SoftFileLock implementation of the filelock package. An attacker with local filesystem access and permission to create symlinks can exploit a race condition between the permission validation and file creation to cause lock operations to fail or behave unexpectedly. The vulnerability occurs in the _acquire() method between raise_on_not_writable_file() (permission c

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 3.20.3..

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/multi-linux-manager/5.1/x86_64/server:5.1.2.8.13.2 Image server-image Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-5.8 Container suse/sl-micro/6.0/base-os-container:2.1.3-5.8 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-5.8 Container suse/sl-micro/6.0/rt-os-container:2.1.3-6.7 Image SL-Micro Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.2 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Development Tools 15 SP7 Fixed

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CVE-2026-22701 vulnerability details – vuln.today
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