VulnerabilityUndergoing Analysis

CVE-2026-19854

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.

MEDIUM 6.1EPSS 0.05%

Does this matter?

Lower severity and a low EPSS score (0.05%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.1 MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS: 0.05% probability · 0th percentile
CISA KEV: Not listed
Weakness: CWE-319
Source: security@grafana.com

References

https://grafana.com/security/security-advisories/cve-2026-19854

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.