{"schema_version":"1.9.0","id":"CVE-2018-1000518","published":"2018-06-26T16:29:01.243Z","modified":"2026-08-27T08:13:44.017888Z","aliases":["GHSA-6g87-ff9q-v847","PYSEC-2018-79"],"related":["SUSE-SU-2023:2783-1","SUSE-SU-2023:2783-2","openSUSE-SU-2024:11280-1","openSUSE-SU-2024:14166-1","openSUSE-SU-2026:11240-1"],"details":"aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-websockets/websockets","events":[{"introduced":"93c7bc1446f1f9e99b0919dceacf84fd92832811"},{"last_affected":"93c7bc1446f1f9e99b0919dceacf84fd92832811"}],"database_specific":{"cpe":"cpe:2.3:a:websockets_project:websockets:4.0:*:*:*:*:python:*:*","extracted_events":[{"introduced":"4.0"},{"last_affected":"4.0"}],"source":"CPE_STRING"}}],"versions":["4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1000518.json"}}],"references":[{"type":"FIX","url":"https://github.com/aaugustin/websockets/pull/407"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}