Python up to 3.14.x TemporaryDirectory Cleanup tempfile.TemporaryDirectory race condition

Summaryinfo

A vulnerability categorized as problematic has been discovered in Python up to 3.14.x. This affects the function tempfile.TemporaryDirectory of the component TemporaryDirectory Cleanup. Such manipulation leads to race condition. This vulnerability is referenced as CVE-2026-12345. The attack can only be performed from a local environment. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Python up to 3.14.x. It has been rated as problematic. Affected by this issue is the function tempfile.TemporaryDirectory of the component TemporaryDirectory Cleanup. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is integrity, and availability. CVE summarizes:

The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of the temporary directory to be deleted or have their permissions and file flags reset, with the privileges of the process performing the cleanup. Note that platforms where shutil.rmtree.avoids_symlink_attacks is false, remain affected, and file flags may still be reset outside of the tree on all platforms.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-12345 since 06/15/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 3.15.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Name

• Python

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14

License

• open-source

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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