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VULNERABILITIES

CVE-2026-4269 Details

Description

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 affects users of the Bedrock AgentCore Starter Toolkit before version v0.1.13 who build or have built the Toolkit after September 24, 2025. Any users on a version >=v0.1.13, and any users on previous versions who built the toolkit before September 24, 2025 are not affected. To remediate this issue, customers should upgrade to version v0.1.13.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: AMZNCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-008-AWS/ AMZNVendor Advisory
https://github.com/aws/bedrock-agentcore-starter-toolkit/releases/tag/v0.1.13 AMZNRelease Notes

Weakness Enumeration

CWE-IDCWE NameSource
CWE-283Unverified OwnershipAMZN
CWE-340Generation of Predictable Numbers or IdentifiersAMZN

Affected Products

ProductVersions
amazon bedrock agentcore starter toolkit
< 0.1.13

CPE

  • cpe:2.3:a:amazon:bedrock_agentcore_starter_toolkit:*:*:*:*:*:python:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-4269
NVD Published Date:
Mar 16, 2026
NVD Last Modified:
Jun 17, 2026
Source:
AMZN
CVE-2026-4269 Details - Not Deferred