Vulnerability · Published Oct 30, 2026 · Assigned by ClickHouse
CVE-2026-116366Unauthenticated RCE vulnerability against ClickHouse Server
Critical 9.5
In plain English
A critical-severity integer overflow in ClickHouse from ClickHouse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.
Severity (CVSS 4.0)9.5Critical
Exploit odds (30 days)1.0%top 38.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling2Nuclei, Public PoC
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | clickhouse | no fix listed | DEBIAN-CVE-2026-116366 |
| Ubuntu:24.04:LTS | clickhouse | no fix listed | UBUNTU-CVE-2026-116366 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ClickHouse | ClickHouse | 26.3 – before 26.3.62.3-lts26.8 – before 26.8.36.3-lts26.9 – before 26.9.27.3-stable26.10 – before 26.10.3.7-stable |
| ClickHouse | ClickHouse Cloud | 25.12 – before 25.12.1.171326.2 – before 26.2.1.83526.4 – before 26.4.1.270426.6 – before 26.6.1.243926.8 – before 26.8.1.59726.10 – before 26.10.2.84 |
Weakness: CWE-190 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H