EUVD-2026-50412
GHSA-vh7m-4w88-p24f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CREATE DICTIONARY is a privileged DDL operation, so PR:L rather than PR:N; network-reachable with low complexity, and claimed code execution justifies C/I/A high.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
SQL Injection vulnerability in ClickHouse Server Versions <= 26.3.9.8 allows a remote attacker to execute arbitrary code via the create dictionaries function.
AnalysisAI
SQL injection in ClickHouse Server versions 26.3.9.8 and earlier lets remote attackers inject arbitrary SQL through the CREATE DICTIONARY functionality, which the advisory claims can escalate to arbitrary code execution. Publicly available exploit code exists (GitHub repository CVE-2026-51992), but there is no CISA KEV listing and no EPSS score in the provided data, so no confirmed active exploitation. The provided CVSS is 9.1, though the description's reference to the CREATE DICTIONARY operation suggests an authenticated privilege may actually be required, which conflicts with the PR:N in the supplied vector.
Technical ContextAI
ClickHouse is a high-performance open-source columnar OLAP database used for real-time analytics over large datasets. It supports external dictionaries (via CREATE DICTIONARY) that pull data from backends such as PostgreSQL, MySQL, ODBC, and HTTP sources; the referenced documentation is the PostgreSQL dictionary source. The root cause is CWE-89 (SQL Injection): attacker-influenced input is concatenated into a SQL query - plausibly the query template or connection parameters passed to an external dictionary source - without proper parameterization, allowing query manipulation. The claim of arbitrary code execution likely stems from ClickHouse's ability to reach external data sources or execute functions via a crafted dictionary definition rather than classic in-database RCE, though the exact mechanism is not detailed in the input.
RemediationAI
No vendor-released patch version was identified in the provided data, and no vendor security advisory URL was supplied - only the NVD record (https://nvd.nist.gov/vuln/detail/CVE-2026-51992) and ClickHouse documentation. Because the flaw affects versions up to 26.3.9.8, upgrade to the latest ClickHouse Server release once a fixed version is confirmed by ClickHouse; do not rely on an invented version number. In the interim, restrict who can invoke CREATE DICTIONARY by tightening ClickHouse RBAC so only trusted administrators hold DICTIONARY/DDL privileges (trade-off: breaks self-service dictionary workflows), disable or lock down external dictionary sources such as PostgreSQL/MySQL/ODBC/HTTP if not required (trade-off: loses external-source enrichment), and place the ClickHouse native (9000) and HTTP (8123) ports behind network segmentation so they are not internet-reachable (trade-off: none for properly internal deployments). Monitor query logs for anomalous CREATE DICTIONARY statements and outbound connections from the server to attacker-controlled hosts.
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