{"id":"CVE-2018-1000518","aliases":["GHSA-6g87-ff9q-v847","PYSEC-2018-79"],"url":"https://o3.security/vulnerability/CVE-2018-1000518","summary":"websockets is vulnerable to denial of service by memory exhaustion","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.","published":"2018-06-26T16:29:01.243Z","modified":"2026-08-27T08:13:44.017888Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"websockets","fixedVersion":"5.0"}],"fix":{"url":"https://github.com/aaugustin/websockets/pull/407","label":"aaugustin/websockets#407"},"references":[{"type":"FIX","url":"https://github.com/aaugustin/websockets/pull/407"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:13:44.017888Z"}}