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It was discovered that ClickHouse incorrectly handled memory, leading to a
heap out-of-bounds data read. An attacker could possibly use this issue to
cause a denial of service, or leak sensitive information.
(CVE-2021-42387, CVE-2021-41388)

It was discovered that ClickHouse incorrectly handled memory, leading to a
heap-based buffer overflow. An attacker could possibly use this issue to
cause a denial of service, or execute arbitrary code.
(CVE-2021-43304, CVE-2021-43305)

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