Strands Agents SDK: Exposure of data element to wrong session in the A2A Server
CVE-2026-115419
Summary Strands Agents SDK is an open-source SDK, available for Python (strands-agents) and TypeScript (@strands-agents/sdk), for building and running AI agents. An issue exists where, under certain circumstances, the Agent2Agent (A2A) server shares conversation history across callers with different context\id values, allowing one caller to read and influence another caller's session. Impact The A2A server did not properly isolate conversation state between callers. In multi-tenant deployments, an authenticated remote user could access another caller's conversation history or influence model behavior for other callers (CWE-488: Unintended Disclosure of Data Element to Wrong Session). This affects any deployment where an A2A server is reachable by more than one user or tenant. Impacted versions: strands-agents (Python): all versions containing the multiagent.a2a module, < 1.43.0 @strands-agents/sdk (TypeScript): < 1.5.0 Patches This issue has been addressed in strands-agents version 1.43.0 and @strands-agents/sdk version 1.5.0. The A2A server now uses an agent factory so conversation state is isolated per A2A context\id. We recommend upgrading to the latest version and ensuring any…
Part of the AI stack
This affects Strands Agents, in Agent frameworks.
Assessment
- CVSS
- 8.6 (v4.0)
- Severity
- High
- EPSS
- 0.43% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 22 October 2026
- Last updated
- 30 October 2026
- Affected
- pip, npm · strands-agents, @strands-agents/sdk
- Weakness
- CWE-488
- Assigner
- AMZN
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
At the source
References
- https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m
- https://nvd.nist.gov/vuln/detail/CVE-2026-115419
- https://github.com/strands-agents/harness-sdk/pull/2628
- https://github.com/strands-agents/harness-sdk/pull/2696
- https://github.com/strands-agents/harness-sdk/commit/398343faad0e485f2e441dab70355c9a52382537
- https://github.com/strands-agents/harness-sdk/commit/403d87847e738e1c73909858d989cedcb67f0afa
- https://github.com/strands-agents/harness-sdk/commit/f8ba9376fe4b8330d526b6480b47c4440150e0cd
- https://aws.amazon.com/security/security-bulletins/2026-146-aws
- https://github.com/strands-agents/harness-sdk/releases/tag/python/v1.43.0
- https://github.com/strands-agents/harness-sdk/releases/tag/typescript/v1.5.0
- https://pypi.org/project/strands-agents/1.43.0
- https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0
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