{"cve":"CVE-2025-13836","nvd":{"published":"2025-12-01T18:16:04.200","modified":"2026-09-03T03:15:20.653","status":"Analyzed","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.","cvss_v4":{"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","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628","https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15","https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155","https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5","https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0"],"products":["python:python"],"source":"nvd","synced_at":"2026-10-19T22:16:02.354564667+00:00"},"epss":{"cve":"CVE-2025-13836","score":0.01631,"percentile":0.76235,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}