CVE-2025-13836

HIGH7.5EPSS 0.21%

Excessive read buffering DoS in http.client

Published: 12/1/2025Modified: 5/16/2026

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 packages (8)

Bitnami/libpythonfrom 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.11, >= 3.14.0, < 3.14.1
Bitnami/pythonfrom 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.11, >= 3.14.0, < 3.14.1
Bitnami/python-minfrom 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.11, >= 3.14.0, < 3.14.1
Debian/pypy3from 0
Debian/python3.11from 0, < 3.11.2-6+deb12u7
Debian/python3.13from 0, < 3.13.5-2+deb13u1
Debian/python3.14from 0, < 3.14.2-1
Debian/python3.9from 0, < 3.9.2-1+deb11u4

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Affected packages (8)

CVSS scores

References (11)