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CVE-2026-61788— @bytebase/dbhub's read-only mode does not prevent database writes

Quick assessment

Affected
bytebase dbhub
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DBHub 是一个支持 PostgreSQL、MySQL、SQL Server、Oracle、MariaDB 和 SQLite 等数据库的 MCP（Model Context Protocol）服务器。在版本 0.22.6 之前，即使将 工具的 参数设置为 ，也无法使数据库连接真正变为只读状态。 尽管连接器代码旨在设置 PostgreSQL 的 （并将 SQLite 以只读模式打开），但这段逻辑被一个配置值所控制，而该配置值从未被正确填充，导致相关代码从未执行。因此，唯一剩余的只读保护机制是一个基于分类器的简单检查

CVSS 7.4 · High EPSS 0.30% · P21
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I. Basic Information for CVE-2026-61788

Vulnerability Information
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Vulnerability Title
@bytebase/dbhub's read-only mode does not prevent database writes
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bytebase dbhub < 0.22.6 -

II. Public POCs for CVE-2026-61788

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III. Intelligence Information for CVE-2026-61788

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Other References for CVE-2026-61788 (1)

IV. Related Vulnerabilities

Same product: dbhub
Same vendor: bytebase
Same weakness: CWE-184

V. Comments for CVE-2026-61788

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