CVE-2026-85788: Incomplete list of disallowed inputs in awslabs mysql-mcp-server

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-09
Weakness: CWE-184

Description

Incomplete list of disallowed inputs in the mutable SQL detector component in Amazon awslabs mysql-mcp-server might allow context-dependent actors to bypass the read-only enforcement gate and reach file-read and file-write SQL sinks via SQL inline comments that the regex engine does not treat as whitespace. To remediate this issue, users should upgrade to version 1.0.23.

Affected products

AWS Labs MySQL MCP Server: through 1.0.21

References

https://aws.amazon.com/security/security-bulletins/2026-103-aws/
https://github.com/awslabs/mcp/releases?page=2#release-2026.07.20260702161703
https://github.com/awslabs/mcp/security/advisories/GHSA-x25m-ph3m-3r9q

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