[Security-announce][CVE-2025-13836] Excessive read buffering DoS in http.client

There is a MEDIUM severity vulnerability affecting CPython.

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

Please see the linked CVE ID for the latest information on affected versions:

• https://www.cve.org/CVERecord?id=CVE-2025-13836
• https://github.com/python/cpython/pull/119454