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CriticalVulnerabilityCVE-2026-116366updated 30 Oct 2026, 15:24 UTC

ClickHouse Server flaw lets outsiders run code on the server

A bug in the ClickHouse database server could let someone on the network run their own commands on the machine without logging in. Under certain conditions, an attacker could take control of the server.

Official, 2 sources
SeverityCriticalCVSS 9.5 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

What happened

An issue in ClickHouse Server allows an unauthenticated network user to execute arbitrary code on the server under certain conditions.

Why it is dangerous: An attacker who gains code execution can read or alter the stored data, use the server as a foothold into the rest of the network, and disrupt services that depend on it.

Are you affected?

You are affected if you run ClickHouse Server in a configuration that exposes it to the network, but the exact versions and conditions are not stated in the available material.

unknown

What to do

  1. Restrict network access to ClickHouse Server so only trusted hosts can reach it
  2. Check the official GitHub advisory GHSA-qhgw-ghp3-xh36 for affected versions and the patched release
  3. Update ClickHouse Server to the fixed version as soon as it is confirmed

Timeline

  1. 30 Oct 2026, 11:17 UTC
    Publicly disclosed
  2. 30 Oct 2026, 11:17 UTC
    Reported by NVD · NVD
  3. 30 Oct 2026, 11:26 UTC
    Picked up by Zero Radar
  4. 30 Oct 2026, 15:24 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-116366 · GHSA-qhgw-ghp3-xh36
CVSS
9.5 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
30 Oct 2026, 11:17 UTC
On Zero Radar
30 Oct 2026, 11:26 UTC (9 min after disclosure)
Last change
30 Oct 2026, 15:24 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

ClickHouse Server flaw lets outsiders run code on the server · Zero Radar