CVE-2026-116366
Received Received - Intake

Remote Code Execution in ClickHouse Server

Publication date: 2026-10-30

Last updated on: 2026-10-30

Assigner: ClickHouse

Description
An issue has been discovered in ClickHouse Server that, under certain conditions, could allow an unauthenticated user with network access to execute arbitrary code on the ClickHouse Server.

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Meta Information

Published
2026-10-30
Last Modified
2026-10-30
Generated
2026-10-30
AI Q&A
2026-10-30
EPSS Evaluated
N/A
NVD
CVE-2026-116366
EUVD
EUVD-2026-113778

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
ClickHouse ClickHouse 26.3
ClickHouse ClickHouse 26.8
ClickHouse ClickHouse 26.9
ClickHouse ClickHouse 26.10

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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Executive Summary

CVE-2026-116366 is a vulnerability in ClickHouse Server that allows an unauthenticated user with network access to execute arbitrary code on the server under certain conditions. The issue was discovered and fixed in specific versions of ClickHouse.

Detection Guidance

To detect this vulnerability, check if your ClickHouse Server version is below the patched versions (v26.10.3.7, v26.3.62.3-lts, v26.8.36.3-lts, v26.9.27.3-stable, v26.10.3.7-stable). Run the command: clickhouse-server --version to verify the installed version.

Impact Analysis

This vulnerability could allow attackers to take control of the ClickHouse Server, potentially leading to data breaches, unauthorized access to sensitive information, or disruption of services. It poses a high risk due to the potential for arbitrary code execution.

Mitigation Strategies

Immediately upgrade ClickHouse Server to a patched version (v26.10.3.7, v26.3.62.3-lts, v26.8.36.3-lts, v26.9.27.3-stable, or v26.10.3.7-stable). If using ClickHouse Cloud or BYOC, the fix is already applied. Restrict network access to the server until patched.

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