What is CVE-2026-115419?

CVE-2026-115419 is a high-severity vulnerability in AWS Strands-Agents, classified under CWE-488. CVSS score: 8.1/10. Published 2026-10-22.

How severe is CVE-2026-115419?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in AWS Strands-Agents

CVE-2026-115419

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 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-488

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-115419?: CVE-2026-115419 is a high-severity vulnerability in AWS Strands-Agents, classified under CWE-488. CVSS score: 8.1/10. Published 2026-10-22.
How severe is CVE-2026-115419?: High severity. CVSS v3 base score is 8.1 out of 10.