Medium
Security advisory
Divide-by-zero in Clickhouse's Delta compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-42389
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:30 UTC · Revision 1
Source evidence
Divide-by-zero in Clickhouse's Delta compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.
osv:CVE-2021-42389
Complete source record
{
"id": "1b7fa2f6f6a88cc3e2e2496282e43cf0769d57de8db33747834b72c89f91ed4c",
"url": "https://osv.dev/vulnerability/CVE-2021-42389",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-42389",
"summary": "Divide-by-zero in Clickhouse's Delta compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.",
"evidence": "osv:CVE-2021-42389",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-42389",
"aliases": [
"CVE-2021-42389"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/clickhouse/clickhouse",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5adad0ff121319c172eae302bcef8b67b305557f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "21.10.2.15"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42389.json"
}
}
],
"modified": "2026-10-24T10:30:40.372373767Z",
"provider": "osv",
"references": [
"https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-42389",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434907,
"published_at": "2022-03-14T23:15:08.017+00:00"
}