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CVE-2026-4269— Improper S3 ownership verification in Bedrock AgentCore Starter Toolkit

Quick assessment

Affected
AWS Bedrock AgentCore Starter Toolkit
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bedrock AgentCore Starter Toolkit是Amazon Web Services开源的一个AI智能体开发与部署工具包。 Bedrock AgentCore Starter Toolkit v0.1.13之前版本存在安全漏洞，该漏洞源于缺少S3所有权验证，可能导致远程攻击者在构建过程中注入代码，进而在AgentCore Runtime中执行代码。

CVSS 7.5 · High EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4269

Vulnerability Information
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Vulnerability Title
Improper S3 ownership verification in Bedrock AgentCore Starter Toolkit
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可预测问题
Source: CVE Program / CVE List V5
Vulnerability Title
Bedrock AgentCore Starter Toolkit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bedrock AgentCore Starter Toolkit是Amazon Web Services开源的一个AI智能体开发与部署工具包。 Bedrock AgentCore Starter Toolkit v0.1.13之前版本存在安全漏洞，该漏洞源于缺少S3所有权验证，可能导致远程攻击者在构建过程中注入代码，进而在AgentCore Runtime中执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS Bedrock AgentCore Starter Toolkit 0.1.0 ~ 0.1.13 -

II. Public POCs for CVE-2026-4269

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 15720 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-4269

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Vendor Advisories for CVE-2026-4269 (1)

Vendor Pages for CVE-2026-4269 (1)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-340