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CVE-2026-116366

Unauthenticated RCE vulnerability against ClickHouse Server

9.5 CriticalPublic exploit

CVE-2026-116366 is a critical vulnerability (CVSS 9.5) in Clickhouse, published October 30, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 62nd percentile. No source names a fixed version.

What does this mean?
Severity
9.5 CriticalCVSS 4.0, CVE List
Exploit chance
0.96%EPSS, 62nd percentile
Exploitation
None known2 public exploits
Fixed in
No fix listedNo source names one

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.96%Up 0.6 points since Oct 31, 2026
90%50%10%1%

Discussion

Quiet in the last day.
14 days ago: 2 people13 days ago: 0 people12 days ago: 1 person11 days ago: 2 people10 days ago: 1 person9 days ago: 0 people8 days ago: 0 people7 days ago: 0 people6 days ago: 0 people5 days ago: 0 people4 days ago: 0 people3 days ago: 0 people2 days ago: 0 people1 day ago: 0 peopleLast 24 hours: 0 people

Affected products

Affected packages

Affected packages
PackageAffectedFixed
clickhouse
Debian:12
All versions, plus listed versions
18.16.1+ds-7.318.16.1+ds-7.4
None known
clickhouse
Ubuntu:20.04:LTS
All versions, plus listed versions
18.16.1+ds-518.16.1+ds-5ubuntu118.16.1+ds-5ubuntu218.16.1+ds-6ubuntu118.16.1+ds-718.16.1+ds-7ubuntu0.1
None known
clickhouse
Ubuntu:24.04:LTS
All versions, plus listed versions
18.16.1+ds-7.418.16.1+ds-7.4build118.16.1+ds-7.4build2
None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubgooglesky/CVE-2026-1163662026-10-31
NucleiClickHouse Server - Brotli v1.2.0 Decoder DoS/OOB-Write

What each source reports

CVE List Score used9.5

Unauthenticated RCE vulnerability against ClickHouse Server

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.

Record
CVE-2026-116366
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness
CWE-190
Updated
2026-11-02
EUVDEUVD-2026-1137789.5

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.

Record
EUVD-2026-113778
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-qhgw-ghp3-xh369.5

An issue has been discovered in ClickHouse Server that, under certain conditions, could allow an...

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.

Record
GHSA-qhgw-ghp3-xh36
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-190
Updated
2026-11-02
NVD9.5

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.

Record
CVE-2026-116366
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-190
Updated
2026-11-02
OSVDEBIAN-CVE-2026-1163669.5

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.

Record
DEBIAN-CVE-2026-116366
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-1163669.5

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.

Record
UBUNTU-CVE-2026-116366
CVSS 4.0
9.5 CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Updated
2026-11-05

History

History
RecordedChangedSources
affected, aliases, exploits, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, Nuclei, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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