CVE-2025-13836

medium

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.

References

https://mail.python.org/archives/list/[email protected]/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/

https://github.com/python/cpython/pull/119454

https://github.com/python/cpython/issues/119451

https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5

https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155

Details

Source: Mitre, NVD

Published: 2025-12-01

Updated: 2025-12-02

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 6.3

Vector: 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

Severity: Medium

EPSS

EPSS: 0.00042