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CVE-2026-115419

CVE-2026-115419 · Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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).

CVSS 8.6 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: python · node

Affected products and versions

  • strands-agents

    Versions
    • ≥ 0, < 1.43.0: Affected (custom)

    Update to 1.43.0

  • strands-agents/sdk

    Versions
    • ≥ 0, < 1.5.0: Affected (custom)

    Update to 1.5.0

  • strands-agents PyPI

    Versions
    • 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
    • 1.0.0
    • 1.0.1
    • 1.1.0
    • 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
    • 1.2.0
    • 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
    • 1.3.0
    • 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
    • 1.4.0
    • 1.40.0
    • 1.41.0
    • 1.42.0
    • 1.5.0
    • 1.6.0
    • 1.7.0
    • 1.7.1
    • 1.8.0
    • 1.9.0
    • 1.9.1
    Affected ranges
    • ECOSYSTEM: < 1.43.0

    Update to 1.43.0

  • @strands-agents/sdk npm

    Affected ranges
    • SEMVER: < 1.5.0

    Update to 1.5.0

Original sources

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