CVE-2018-1000117

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-07 · updated 2026-06-17
Weakness: CWE-120

Description

Python Software Foundation CPython version From 3.2 until 3.6.4 on Windows contains a Buffer Overflow vulnerability in os.symlink() function on Windows that can result in Arbitrary code execution, likely escalation of privilege. This attack appears to be exploitable via a python script that creates a symlink with an attacker controlled name or location. This vulnerability appears to have been fixed in 3.7.0 and 3.6.5.

Affected products

Python: from 3.2.0 before 3.4.9; from 3.5.0 before 3.5.6; from 3.6.0 before 3.6.5; 3.7.0-beta1, 3.7.0-beta2, 3.7.0-beta3, 3.7.0-beta4, 3.7.0-beta5 — fixed in 3.4.9, 3.5.6, 3.6.5

How to fix

Upgrade to a fixed version: Python 3.4.9, 3.5.6, 3.6.5. Check the vendor advisory for mitigations.

References

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