Skip to content
OpenAdvisories
Critical · 9.5 Scanner template Public exploit CVE-2026-116366 EUVD-2026-113778GHSA-qhgw-ghp3-xh36

Unauthenticated RCE vulnerability against ClickHouse Server

Published Oct 30, 2026 · Updated Oct 30, 2026 · Assigned by ClickHouse

Vendor: ClickHouse Product: ClickHouse Product: ClickHouse Cloud Package: clickhouse Package: clickhouse Package: clickhouse-26.2 Package: clickhouse-26.3 Package: clickhouse-26.4 Package: clickhouse-26.5 Package: clickhouse-keeper-26.2 Package: clickhouse-keeper-26.3 Package: clickhouse-keeper-26.4 Package: clickhouse-keeper-26.5 Ecosystem: Debian Ecosystem: Ubuntu Ecosystem: Wolfi

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.

Affected products

VendorProductAffectedFixed
ClickHouse ClickHouse 26.3 – < 26.3.62.3-lts, 26.8 – < 26.8.36.3-lts, 26.9 – < 26.9.27.3-stable, 26.10 – < 26.10.3.7-stable 26.3.62.3-lts
ClickHouse ClickHouse Cloud 25.12 – < 25.12.1.1713, 26.2 – < 26.2.1.835, 26.4 – < 26.4.1.2704, 26.6 – < 26.6.1.2439, 26.8 – < 26.8.1.597, 26.10 – < 26.10.2.84 25.12.1.1713

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 12 clickhouse No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS clickhouse No fix yet —
Ubuntu 20.04 LTS clickhouse No fix yet —

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling clickhouse-26.2 +7 No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • googlesky/CVE-2026-116366 ★ 3 · Oct 31, 2026

    PoC for CVE-2026-116366 — ClickHouse Server unauthenticated RCE (brotli v1.2.0 decoder out-of-bounds write): differential detector, weaponized DoS, containerized vulnerable-vs-fixed lab, root-cause a…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

References