Medium severity · published Aug 27, 2026
CVE-2026-19854
CVE-2026-19854 CVE Record
6.1
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 0% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
3.1.0 through 4.20.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19854
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19854
grafana.com
https://grafana.com/security/security-advisories/cve-2026-19854
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