GHSA-4v6f-7vjh-6x4m

Source

https://github.com/advisories/GHSA-4v6f-7vjh-6x4m

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4v6f-7vjh-6x4m/GHSA-4v6f-7vjh-6x4m.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-4v6f-7vjh-6x4m

Aliases

CVE-2026-115419

Published

2026-10-23T20:48:29Z

Modified

2026-10-23T21:00:06Z

Severity

8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
8.6 (High) CVSS_V4 - 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 CVSS Calculator

Summary

Strands Agents SDK: Exposure of data element to wrong session in the A2A Server

Details

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 forked or derivative code is patched to incorporate the new fixes.

Workarounds
There is no workaround that fully addresses this issue in affected versions. Until you upgrade, do not expose an A2A server to more than one user or tenant. If multiple callers need access, run a separate A2A server instance for each user or tenant.

References
If you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Database specific

{
    "cwe_ids":  [
        "CWE-488"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-23T20:48:29Z",
    "nvd_published_at":  "2026-10-22T21:17:17Z",
    "severity":  "HIGH"
}

References

Affected packages

PyPI / strands-agents

Package

Name: strands-agents; View open source insights on deps.dev
Purl: pkg:pypi/strands-agents

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.43.0

Affected versions

0.*

0.0.1

0.1.0

0.1.1

0.1.2

0.1.3

0.1.4

0.1.5

0.1.6

0.1.7

0.1.8

0.1.9

0.2.0

0.2.1

0.3.0

1.*

1.0.0

1.0.1

1.1.0

1.2.0

1.3.0

1.4.0

1.5.0

1.6.0

1.7.0

1.7.1

1.8.0

1.9.0

1.9.1

1.10.0

1.11.0

1.12.0

1.13.0

1.14.0

1.15.0

1.16.0

1.17.0

1.18.0

1.19.0

1.20.0

1.21.0

1.22.0

1.23.0

1.24.0

1.25.0

1.26.0

1.27.0

1.28.0

1.29.0

1.30.0

1.31.0

1.32.0

1.33.0

1.34.0

1.34.1

1.35.0

1.36.0

1.37.0

1.38.0

1.39.0

1.40.0

1.41.0

1.42.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4v6f-7vjh-6x4m/GHSA-4v6f-7vjh-6x4m.json"

npm / @strands-agents/sdk

Package

Name: @strands-agents/sdk; View open source insights on deps.dev
Purl: pkg:npm/%40strands-agents/sdk

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.5.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4v6f-7vjh-6x4m/GHSA-4v6f-7vjh-6x4m.json"