{"id":"CVE-2020-26759","aliases":["BIT-clickhouse-2020-26759","GHSA-vgv5-cxvh-vfxh","PYSEC-2021-61"],"url":"https://o3.security/vulnerability/CVE-2020-26759","summary":"Arbitrary code execution in clickhouse-driver","details":"clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.","published":"2021-01-06T13:15:13.783Z","modified":"2026-07-08T17:57:13.468008Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"clickhouse-driver","fixedVersion":"0.1.5"}],"fix":{"url":"https://github.com/mymarilyn/clickhouse-driver/commit/3e990547e064b8fca916b23a0f7d6fe8c63c7f6b","label":"mymarilyn/clickhouse-driver@3e99054"},"references":[{"type":"FIX","url":"https://github.com/mymarilyn/clickhouse-driver/commit/3e990547e064b8fca916b23a0f7d6fe8c63c7f6b"},{"type":"FIX","url":"https://github.com/mymarilyn/clickhouse-driver/commit/d708ed548e1d6f254ba81a21de8ba543a53b5598"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T17:57:13.468008Z"}}