CVE-2026-4269

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.

Risk Information

Base Score

7.5

MODERATE

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score

Exploitation Probability

0.051

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2026-4269 are fixed in Python-bedrock-agentcore-starter-toolkit 0.1.13	Windows
Vulnerabilities CVE-2026-4269 are fixed in Python-bedrock-agentcore-starter-toolkit for linux 0.1.13	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234