EUVD-2026-12490
GHSA-xfhr-q72q-jcrj
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Tags
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.
Analysis
Remote code execution in Bedrock AgentCore Starter Toolkit versions before v0.1.13 allows unauthenticated attackers to inject malicious code during the build process by exploiting missing S3 ownership verification, affecting only users who built the toolkit after September 24, 2025. An attacker can achieve arbitrary code execution within the AgentCore Runtime environment. …
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Remediation
Within 24 hours: Identify all internal builds of AgentCore Starter Toolkit created after September 24, 2025 and document toolkit versions in use. Within 7 days: Upgrade to version v0.1.13 or later; if unable to upgrade immediately, isolate affected build environments from production networks. …
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External POC / Exploit Code
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