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).

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS strands-agents unaffected
Version Status Constraints
0 affected < 1.43.0
AWS strands-agents/sdk unaffected
Version Status Constraints
0 affected < 1.5.0

No data.

No data.

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Project Subscriptions

Vendors Products
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Strands-agents Sdk Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-146-aws/ cve-icon cve-icon
https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m cve-icon cve-icon
https://pypi.org/project/strands-agents/1.43.0/ cve-icon cve-icon
https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0 cve-icon cve-icon
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'}

Projects

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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