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CVE-2025-13836

Excessive read buffering DoS in http.client

Published: 12/1/2025 Last updated: 12/22/2025 Reserved: 12/1/2025

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.

CNA assigner: PSF (28c92f92-d60d-412d-b760-e73465c3df22) Requested by: n/a

Metrics

Version Score Severity Vector String
4.0 6.3 Medium CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Opam packages affected (7)

conf-python-2-7 conf-python-2-7-dev conf-python-3 conf-python-3-7 conf-python-3-dev py termbox

Products affected (2)

Product Vendor Version
CPython Python Software Foundation n/a
CPython Python Software Foundation QCM4290

References (14)