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Vulnerability record · CVE-2014-2667 · published 16 November 2014

CVE-2014-2667: Python race condition vulnerability

Python · Python

Race condition in the _get_masked_mode function in Lib/os.py in Python 3.2 through 3.5, when exist_ok is set to true and multiple threads are used, might allow local users to bypass intended file permissions by leveraging a separate application vulnerability before the umask has been set to the expected value.

3.3 CVSS 2.0 Low EPSS 0.36% · top 70.2% CWE-362 · Race condition
3.3CVSS 2.0 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

Race condition in the _get_masked_mode function in Lib/os.py in Python 3.2 through 3.5, when exist_ok is set to true and multiple threads are used, might allow local users to bypass intended file permissions by leveraging a separate application vulnerability before the umask has been set to the expected value.

AV:L/AC:M/Au:N/C:P/I:P/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugs.python.org/issue21082 Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00007.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00008.html
http://www.openwall.com/lists/oss-security/2014/03/28/15
http://www.openwall.com/lists/oss-security/2014/03/29/5
http://www.openwall.com/lists/oss-security/2014/03/30/4
https://security.gentoo.org/glsa/201503-10
http://bugs.python.org/issue21082 Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00007.html
http://lists.opensuse.org/opensuse-updates/2014-05/msg00008.html
http://www.openwall.com/lists/oss-security/2014/03/28/15
http://www.openwall.com/lists/oss-security/2014/03/29/5
http://www.openwall.com/lists/oss-security/2014/03/30/4
https://security.gentoo.org/glsa/201503-10

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Source: NIST National Vulnerability Database (record CVE-2014-2667), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.