UpHeron
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Servers and applications

CVE-2021-42389

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.

Severity
Medium 6.5
Published
14 Mar 2022
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
21.10.2.15
Sources
NVD

Affected software

SoftwareAffected versions
ClickHouseServers and applications · cpe:a:clickhouse:clickhouse
  • Every version before 21.10.2.15

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-42389
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-42389