CVE-2021-43305

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

Heap buffer overflow in Clickhouse's LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy<copy_amount>(op, ip, copy_end), don’t exceed the destination buffer’s limits. This issue is very similar to CVE-2021-43304, but the vulnerable copy operation is in a different wildCopy call.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-122 CWE-787

Affected software

No affected versions have been published.

Timeline

Published: Mar 14, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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