filelock Time-of-Check-Time-of-Use (TOCTOU) Symlink Vulnerability in SoftFileLock

Mariner

Read the vendor bulletin Get alerts for cbl2 python-filelock 3.0.12-13 on CBL Mariner

5.3CVSS out of 10Medium severity

Scope

What the vendor says is affected

cbl2 python-filelock 3.0.12-13 on CBL Mariner 2.0
cbl2 python-filelock 3.0.12-13 on CBL-Mariner 2.0
azl3 python-filelock 3.20.1-1 on Azure Linux 3.0

Versions the vendor lists as fixed

3.0.12-14
3.20.3-1

Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Jan 13, 2026 at 1:03 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 8, 2026 at 1:51 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Sep 29, 2026 at 11:40 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-22701View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-22701
Last source check: Sep 29, 2026 at 11:40 AM UTC

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Your environment

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Read the vendor's prerequisites and exceptions.
Test the update or mitigation through your normal change process.

Watch cbl2 python-filelock 3.0.12-13 on CBL Mariner

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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