High severity8.1NVD Advisory· Published Mar 14, 2022· Updated Jun 17, 2026
CVE-2021-42387
CVE-2021-42387
Description
Heap out-of-bounds read in Clickhouse's LZ4 compression codec when parsing a malicious query. As part of the LZ4::decompressImpl() loop, a 16-bit unsigned user-supplied value ('offset') is read from the compressed data. The offset is later used in the length of a copy operation, without checking the upper bounds of the source of the copy operation.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*range: <21.10.2.15
- (no CPE)
- yandex/clickhousev5Range: unspecified
Patches
Vulnerability mechanics
References
2- jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmsnvdExploitThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/11/msg00002.htmlnvdMailing ListThird Party Advisory
News mentions
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