{"id":"BIT-libpython-2025-13836","summary":"Excessive read buffering DoS in http.client","details":"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.","aliases":["BIT-python-2025-13836","BIT-python-min-2025-13836","CVE-2025-13836","PSF-2025-14"],"modified":"2026-02-25T09:12:03.804511739Z","published":"2025-12-05T11:07:36.854Z","database_specific":{"cpes":["cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"],"severity":"Medium"},"references":[{"type":"WEB","url":"https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155"},{"type":"WEB","url":"https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5"},{"type":"WEB","url":"https://github.com/python/cpython/issues/119451"},{"type":"WEB","url":"https://github.com/python/cpython/pull/119454"},{"type":"WEB","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13836"},{"type":"WEB","url":"https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15"},{"type":"WEB","url":"https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628"},{"type":"WEB","url":"https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0"},{"type":"WEB","url":"https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c"}],"affected":[{"package":{"name":"libpython","ecosystem":"Bitnami","purl":"pkg:bitnami/libpython"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.13.11"},{"introduced":"3.14.0"},{"fixed":"3.14.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/libpython/BIT-libpython-2025-13836.json"},"severity":[{"type":"CVSS_V4","score":"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"}]}],"schema_version":"1.7.3"}