Exposure of Data Element to Wrong Session Affecting strands-agents package, versions [,1.43.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-STRANDSAGENTS-21460719
- published23 Oct 2026
- disclosed22 Oct 2026
- creditUnknown
Introduced: 22 Oct 2026
NewCVE-2026-115419 (opens in a new tab)How to fix?
Upgrade strands-agents to version 1.43.0 or higher.
Overview
strands-agents is an A model-driven approach to building AI agents in just a few lines of code
Affected versions of this package are vulnerable to Exposure of Data Element to Wrong Session via the A2A server component (multiagent.a2a module), which does not properly isolate conversation state between callers. An authenticated remote user can send HTTP requests to the A2A endpoint using a different context_id to read another tenant's conversation history and inject persistent instructions that alter model behavior for subsequent callers.