---
title: "CVE-2026-61742: DBHub HTTP transport DNS rebinding allows unauthenticated browser-origin SQL execution"
url: https://erroneo.us/security/cve/CVE-2026-61742/
description: "CVE-2026-61742 (@bytebase/dbhub (npm)): DBHub is a database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite. Versions prior to 0.22.5…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-24
date_modified: 2026-09-24
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-61742"
kev: false
cvss: 9.3
epss: 0.00201
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-61742: DBHub HTTP transport DNS rebinding allows unauthenticated browser-origin SQL execution

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.2% , percentile 9: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 9% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @bytebase/dbhub (npm) <= 0.22.4, fixed in 0.22.5 . Check your lockfile, including transitive dependencies.

## What it is

DBHub is a database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite. Versions prior to 0.22.5 expose an unauthenticated HTTP MCP endpoint when started with the documented HTTP transport mode, for example --transport http --port 8080. The HTTP server attempts to protect browser-origin access by checking whether the Origin hostname equals the Host hostname, then reflecting the validated Origin into Access-Control-Allow-Origin. This does not stop DNS rebinding. After an attacker-controlled hostname rebinds to a victim-accessible DBHub HTTP server, both Origin and Host can contain the attacker-controlled hostname, so DBHub accepts the request and dispatches MCP tool calls. As a result, a malicious website can deterministically invoke DBHub MCP tools from the victim's browser without prompt injection or model involvement. With the default demo configuration this can read and write the demo SQLite database; with a real configured database, the same primitive can read, enumerate, and potentially write database contents depending on DBHub's configured tool permissions and database credentials. Version 0.22.5 fixes the issue.

## Affected packages

- npm `@bytebase/dbhub` <= 0.22.4 → fixed: 0.22.5

## Affected products (CVE record)

- bytebase dbhub: < 0.22.5

## Severity

- GitHub_M CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.20% probability of exploitation activity in the next 30 days; percentile 9.

## Sources

- [GitHub Advisory GHSA-fm8p-53ww-hf6w](https://github.com/advisories/GHSA-fm8p-53ww-hf6w)
- [CVE.org record CVE-2026-61742](https://www.cve.org/CVERecord?id=CVE-2026-61742)
- [NVD entry CVE-2026-61742](https://nvd.nist.gov/vuln/detail/CVE-2026-61742)
- [github.com](https://github.com/bytebase/dbhub/security/advisories/GHSA-fm8p-53ww-hf6w)
- [github.com](https://github.com/bytebase/dbhub/pull/340)
- [github.com](https://github.com/bytebase/dbhub/commit/5bf5c3242a22e94871dfdf53913c84a5025b7381)
- [github.com](https://github.com/bytebase/dbhub/releases/tag/v0.22.6)

---
Source page: https://erroneo.us/security/cve/CVE-2026-61742/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt