Resource exhaustion in Python - CVE-2025-6075
Published: November 24, 2025
Vulnerability identifier: #VU118735
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-6075
CWE-ID: CWE-400
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Python.org
Affected software:
Python
Python
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources within the os.path.expandvars() function. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
How to mitigate CVE-2025-6075
Install updates from vendor's website.
Sources
- https://github.com/python/cpython/commit/2e6150adccaaf5bd95d4c19dfd04a36e0b325d8c
- https://github.com/python/cpython/commit/631ba3407e3348ccd56ce5160c4fb2c5dc5f4d84
- https://github.com/python/cpython/commit/892747b4cf0f95ba8beb51c0d0658bfaa381ebca
- https://github.com/python/cpython/commit/9ab89c026aa9611c4b0b67c288b8303a480fe742
- https://github.com/python/cpython/commit/c8a5f3435c342964e0a432cc9fb448b7dbecd1ba
- https://github.com/python/cpython/commit/f029e8db626ddc6e3a3beea4eff511a71aaceb5c
- https://github.com/python/cpython/issues/136065
- https://mail.python.org/archives/list/security-announce@python.org/thread/IUP5QJ6D4KK6ULHOMPC7DPNKRYQTQNLA/