Vulnerability · Published Sep 9, 2026 · Assigned by AMZN

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

Medium 5.5

In plain English

A medium-severity security flaw in AWS Labs MySQL MCP Server from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.2%top 91.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
AWS	AWS Labs MySQL MCP Server	0 – through 1.0.21

Weakness: CWE-184 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

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