---
id: CVE-2026-115419
title: >-
  Unintended disclosure of data element to wrong session in Strands Agents SDK
  A2A Server
summary: >-
  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
  rea…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-488
vendor: AWS
product: strands-agents
affected:
  - strands-agents < 1.43.0
  - strands-agents/sdk < 1.5.0
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T20:04:04.191Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115419'
references:
  - url: 'https://pypi.org/project/strands-agents/1.43.0/'
  - url: 'https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-146-aws/'
  - url: >-
      https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.414Z'
---

## Overview

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

- `strands-agents < 1.43.0`
- `strands-agents/sdk < 1.5.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.