CVE-2026-59971 json
MySQL MCP Server: Missing Origin/Host Validation in SSE Transport Enables Unauthenticated SQL Execution (DNS Rebinding / Direct Exposure)
published 2026-09-11 58 d ago modified 2026-10-01 38 d ago also GHSA-rqfv-2mw9-78g2 , PYSEC-2026-4109 , EUVD-2026-78580
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
MySQL MCP Server is a Model Context Protocol server that enables secure interaction with MySQL databases. Prior to 0.4.2, setting MCP_TRANSPORT=sse causes src/mysql_mcp_server/server.py to construct SseServerTransport without security_settings or enable_dns_rebinding_protection, while the Starlette routes /, /sse, and /messages/ have no authentication and the service binds to 0.0.0.0 by default. A network attacker can directly reach execute_sql, or can use DNS rebinding to make a victim's browser relay same-origin requests to a locally bound service, and supply a query that reaches cursor.execute(query). This allows unauthenticated disclosure and modification of the configured database; when the MySQL account has FILE privileges, the same access can read or write server files and may enable code execution. The default stdio transport is not affected. This issue is fixed in 0.4.2.
Patch / fix
- pypi mysql-mcp-server 0.4.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 54 d ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| OSV | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | mysql-mcp-server | <0.4.2 |
0.4.2 |
Affected products
- designcomputer mysql_mcp_server
Classification
References
- github.com /designcomputer/mysql_mcp_server/commit/a96549f4a4d65443fd6e9c7f2324fba9a5c80a82
-
github.com
/designcomputer/mysql_mcp_server/security/advisories/GHSA-rqfv-2mw9-78g2
web
-
github.com
/designcomputer/mysql_mcp_server/issues/92
web
-
github.com
/designcomputer/mysql_mcp_server/releases/tag/v0.4.2
web
-
github.com
/designcomputer/mysql_mcp_server
package
-
pypi.org
/project/mysql-mcp-server
package
-
github.com
/advisories/GHSA-rqfv-2mw9-78g2
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-59971
advisory
Sources
- CVE List CVE-2026-59971
- GitHub Advisory GHSA-rqfv-2mw9-78g2
- NVD CVE-2026-59971
- OSV PYSEC-2026-4109
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.