What is CVE-2026-4269?

CVE-2026-4269 is a high-severity vulnerability in Amazon Bedrock_agentcore_starter_toolkit, classified under CWE-283. CVSS score: 7.5/10. Published 2026-03-16.

How severe is CVE-2026-4269?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Amazon Bedrock_agentcore_starter_toolkit

CVE-2026-4269

A missing S3 ownership verification in the Bedrock AgentCore Starter Toolkit before version v0.1.13 may allow a remote actor to inject code during the build process, leading to code execution in the AgentCore Runtime. This issue only affec…

EPSS: 0.001 (21.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Amazon Bedrock_agentcore_starter_toolkit
Aws Bedrock Agentcore Starter Toolkit — versions 0.1.0

Weakness classification (CWE)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (Release Notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4269?: CVE-2026-4269 is a high-severity vulnerability in Amazon Bedrock_agentcore_starter_toolkit, classified under CWE-283. CVSS score: 7.5/10. Published 2026-03-16.
How severe is CVE-2026-4269?: High severity. CVSS v3 base score is 7.5 out of 10.