CVE-2026-19854
Medium
Description
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Clickhouse Datasource
PublishedAug 27, 2026
First seenAug 27, 2026
Weakness typeCWE-319CWE-319
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Grafana Clickhouse Datasource | 3.1.0 ≤ v ≤ 4.20.0 | — |
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