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CVE-2026-19854: CVE-2026-19854 CVE Record

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-27 · updated 2026-08-31
• Weakness: CWE-319

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.

Affected products

• Grafana Clickhouse Datasource: from 3.1.0 through 4.20.0

References

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

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