Vulnerability Description
DBHub is a database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite. Prior to version 0.22.6, setting `readonly = true` on the `execute_sql` tool does not make the connection read-only. The connectors are written to set PostgreSQL `default_transaction_read_only=on` (and open SQLite in `readOnly` mode), but that code is gated on a config value that is never populated, so it never runs. The only thing left enforcing read-only is a classifier that inspects the first keyword of each statement. Any `SELECT` that writes or has side effects through a function call passes it. With an ordinary role this allows sequence tampering; with a privileged role it allows writing arbitrary files on the server (`lo_export`), reading arbitrary host files (`pg_read_file`), and remote code execution (`dblink` + `COPY ... TO PROGRAM`). The HTTP transport is unauthenticated and binds to `0.0.0.0` by default, so this is reachable by any network caller of `/mcp`. Version 0.22.6 patches the issue.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/bytebase/dbhub/security/advisories/GHSA-mwwr-p57h-56pf
- https://github.com/bytebase/dbhub/security/advisories/GHSA-mwwr-p57h-56pf
FAQ
What is CVE-2026-61788?
CVE-2026-61788 is a vulnerability with a CVSS score of 7.4 (HIGH). DBHub is a database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite. Prior to version 0.22.6, setting `readonly = true` on the `execute_sql` tool does not make the connection read-...
How severe is CVE-2026-61788?
CVE-2026-61788 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61788?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.