CVE-2026-115419

Published: Oct 22, 2026Modified: Oct 23, 2026

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: ff89ba41-3aa1-4d27-914a-91399e9639e5 (Secondary)

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).

Related CWEs

CWE-488

Exposure of Data Element to Wrong Session

The product does not sufficiently enforce boundaries between the states of different sessions, causing data to be provided to, or used by, the wrong session.

References (4)

https://aws.amazon.com/security/security-bulletins/2026-146-aws/

Source: ff89ba41-3aa1-4d27-914a-91399e9639e5

https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m

Source: ff89ba41-3aa1-4d27-914a-91399e9639e5

https://pypi.org/project/strands-agents/1.43.0/

Source: ff89ba41-3aa1-4d27-914a-91399e9639e5

https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0

Source: ff89ba41-3aa1-4d27-914a-91399e9639e5

Timeline

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