Bulletin ID: 2026-077-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 08/06/2026 11:00 AM PDT

Description:

Strands Agents is an open-source SDK for building AI agents. The strands-agents-tools package provides pre-built tools for use with the SDK, including the mongodb_memory, elasticsearch_memory, and mem0_memory tools for storing and retrieving agent memories.

We identified CVE-2026-19111, an insecure direct object reference (IDOR) issue in the mongodb_memory, elasticsearch_memory, and mem0_memory tools. Each tool uses a namespace field as the sole tenant-isolation key, and that namespace was exposed as a parameter the large language model (LLM) could control through the tool schema. A crafted prompt could cause a tool to emit a call with a forged namespace, allowing a remote authenticated user to read, modify, or delete memories belonging to other tenants, or to inject false memories into another tenant's namespace. The standalone mongodb_memory and elasticsearch_memory functions additionally exposed connection parameters, which could allow the memory layer to be redirected to an actor-specified cluster.

Impacted versions: < 0.8.3

Resolution:

This issue has been addressed in strands-agents-tools version 0.8.3. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds:

Until you can upgrade, do not deploy the mongodb_memory, elasticsearch_memory, or mem0_memory tools in multi-tenant agents where end users share a single agent deployment. Restrict these tools to single-tenant deployments in which every request maps to one fixed namespace, and do not use the standalone mongodb_memory or elasticsearch_memory functions that accept connection parameters.

References:

• CVE-2026-19111
• GHSA-mpxq-953j-42m4

Please email aws-security@amazon.com with any security questions or concerns.