Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Bedrock Agentcore Starter Toolkit | < 0.1.13 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-008-AWS/Vendor Advisory
- https://github.com/aws/bedrock-agentcore-starter-toolkit/releases/tag/v0.1.13Release Notes
FAQ
What is CVE-2026-4269?
CVE-2026-4269 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 A...
How severe is CVE-2026-4269?
CVE-2026-4269 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4269?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Bedrock Agentcore Starter Toolkit.