Grafana ClickHouse Plugin TLS Bypass via PDC/secure SOCKS
CVE-2026-19854 Published on August 27, 2026
CVE-2026-19854 CVE Record
When the ClickHouse plugin uses Native protocol (the default) with PDC or secure SOCKS, it asks for TLS but the connection library ignores that and talks to ClickHouse in the clear. Username, password, queries, and results can be read on the hop after the proxy. The server certificate is never checked, and a configured client certificate is not sent.
Weakness Type
Cleartext Transmission of Sensitive Information
The software transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors. Many communication channels can be "sniffed" by attackers during data transmission. For example, network traffic can often be sniffed by any attacker who has access to a network interface. This significantly lowers the difficulty of exploitation by attackers.
Affected Versions
Grafana Clickhouse Datasource:- Version 3.1.0, <= 4.20.0 is affected.