CVE-2026-125271

CVSS 8.5 (high) · published 2026-11-10

Incorrect normalization of operation names in the custom security policy enforcement in awslabs aws-api-mcp-server before 1.5.1 might allow an actor to execute AWS API operations across AWS services that the operator's security policy was configured to deny or require elicitation for, via calls to operations whose names contain consecutive capital letters. To remediate this issue, users should upgrade to version 1.5.1.

Weakness: CWE-863, CWE-1025

Source: NVD CVE-2026-125271

References

• https://aws.amazon.com/security/security-bulletins/2026-176-aws/
• https://github.com/awslabs/mcp/security/advisories/GHSA-4wq9-grf3-qg2p
• https://pypi.org/project/awslabs.aws-api-mcp-server/1.5.1/

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