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).
Published: 2026-10-22
Score: 8.6 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
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).
Title Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server
First Time appeared Aws
Aws strands-agents
Aws strands-agents Sdk
Weaknesses CWE-488
CPEs cpe:2.3:a:aws:strands-agents:*:*:*:*:*:*:*:*
cpe:2.3:a:aws:strands-agents_sdk:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws strands-agents
Aws strands-agents Sdk
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Aws Strands-agents Strands-agents Sdk
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-10-22T20:04:04.191Z

Reserved: 2026-10-22T13:19:51.802Z

Link: CVE-2026-115419

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T21:17:17.790

Modified: 2026-10-22T21:17:17.790

Link: CVE-2026-115419

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T03:45:16Z

Weaknesses
  • CWE-488

    Exposure of Data Element to Wrong Session