Resource exhaustion in Python - CVE-2025-13837
Published: December 6, 2025
Vulnerability identifier: #VU119234
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-13837
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Python.org
Affected software:
Python
Python
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources in Lib/plistlib.py. A remote attacker can pass a specially crafted file to the application, trigger memory exhaustion and perform a denial of service (DoS) attack.
How to mitigate CVE-2025-13837
Install updates from vendor's website.
Sources
- https://github.com/python/cpython/commit/694922cf40aa3a28f898b5f5ee08b71b4922df70
- https://github.com/python/cpython/commit/71fa8eb8233b37f16c88b6e3e583b461b205d1ba
- https://github.com/python/cpython/commit/b64441e4852383645af5b435411a6f849dd1b4cb
- https://github.com/python/cpython/issues/119342
- https://github.com/python/cpython/pull/119343
- https://mail.python.org/archives/list/security-announce@python.org/thread/2X5IBCJXRQAZ5PSERLHMSJFBHFR3QM2C/