CVE-2026-116366

9.5

CVSScritical

Exploitable remotely over the internet · no authentication required.

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 Vector

Network

Privileges Req.

None

User Interaction

None

clickhouseclickhouse cloud

Updated Nov 15, 2026View on NVD →

S4E scanner

criticalProduct Based Web Vulnerabilities~10 seconds

ClickHouse Server - Brotli v1.2.0 Decoder DoS/OOB-Write

ClickHouse Server contains a remote code execution vulnerability caused by improper access control, letting unauthenticated users with network access execute arbitrary code remotely, exploit requires network access. References: https://nvd.nist.gov/vuln/detail/CVE-2026-116366 https://nvd.nist.gov/vuln/detail/CVE-2026-111497 https://github.com/google/brotli/compare/v1.2.0...v1.2.1 Remediation: Upgrade to a fixed ClickHouse release that ships brotli v1.2.1: 26.3.62.3-lts, 26.8.36.3-lts, 26.9.27.3-stable, 26.10.3.7-stable or later. brotli v1.2.1 returns a hard BROTLI_DECODER_ERROR_FORMAT_BLOCK_SWITCH (-17) error immediately on invalid block switch, preventing the infinite loop.

Used 20 times · 10 assets checked · domain, subdomain, ipv4

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CVE history: clickhouse

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