Denial of service in Python



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-13836
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Python
Universal components / Libraries / Scripting languages

Vendor Python.org

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU119233

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/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-2025-13836

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

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 when reading HTTP responses in Lib/http/client.py. A remote attacker can trigger memory exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Python: 3.13.0 - 3.14.0 rc3

CPE2.3 External links

https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15
https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155
https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5
https://github.com/python/cpython/issues/119451
https://github.com/python/cpython/pull/119454
https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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