Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server
- Published
- Last modified
- Status
- published
- Known exploitation
- Not listed in CISA KEV
- Public exploit
- None on Exploit-DB
Summary
The Strands Agents SDK for Python and TypeScript, specifically its A2A server component, is affected. An authenticated remote user could read other callers' conversation history and insert persistent instructions that change how the model responds to later users.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
The A2A server component in Amazon Strands Agents SDK for Python before 1.43.0 and Amazon Strands Agents SDK for TypeScript before 1.5.0 does not properly isolate conversation state between callers. An authenticated remote user could read other tenants' conversation history and add persistent instructions that alter model behavior for subsequent callers via HTTP requests to the A2A endpoint using a different context_id. To mitigate this issue, users should upgrade to strands-agents 1.43.0 (Python) or @strands-agents/sdk 1.5.0 (TypeScript).
Affected versions
- AWS strands-agents
fixed in 1.43.0
- AWS strands-agents/sdk
fixed in 1.5.0