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6.3 Medium

CVE-2025-13836 When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use…

Description

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.

Affected products and versions

Product Affected versions Fixed in
CPython 3.15 3.15.0a1 → < 3.15.0a3 3.15.0a3
CPython 3.14 3.14.0 → < 3.14.1 3.14.1
CPython 3.13 3.13.0 → < 3.13.11 3.13.11
CPython 3.12 3.12.0 → < 3.12.13 3.12.13
CPython 3.11 3.11.0 → < 3.11.15 3.11.15
CPython 3.10 earliest → < 3.10.20 3.10.20

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