EUVD-2026-37802
GHSA-6rfw-mq36-jm8h
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable SDK endpoint, low complexity, requires authenticated low-priv user (PR:L) and a second user to trigger install (UI:R); sandbox-bounded RCE yields high C/I but no availability impact and no scope change.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
2DescriptionCVE.org
Improper neutralization of argument delimiters in the install_packages() method in AWS Bedrock AgentCore Python SDK versions >= 1.1.3 and < 1.6.1 might allow a remote authenticated user to execute arbitrary commands within the Code Interpreter sandbox via crafted package name arguments.
To mitigate this issue, users should upgrade to version 1.6.1.
AnalysisAI
Command injection in the AWS Bedrock AgentCore Python SDK (versions >= 1.1.3, < 1.6.1) allows remote authenticated users to execute arbitrary commands within the Code Interpreter sandbox by supplying crafted package name arguments to the install_packages() method. The flaw stems from improper neutralization of argument delimiters (CWE-88), letting attacker-controlled strings break out of the intended pip-install argument context. No public exploit identified at time of analysis, but a vendor patch and advisory are available from AWS.
Technical ContextAI
AWS Bedrock AgentCore is Amazon's framework for building generative-AI agents, and the Python SDK exposes a Code Interpreter sandbox in which agents can run user-supplied code, including installing additional Python packages. The install_packages() helper composes a shell or subprocess invocation (typically wrapping pip install) using caller-supplied package name strings. Because those strings are not sanitized for argument delimiters such as spaces, --flags, or shell separators, a malicious package name can inject additional pip arguments (CWE-88: Improper Neutralization of Argument Delimiters in a Command, aka 'Argument Injection') and pivot package installation into arbitrary command execution inside the sandbox. The CPE cpe:2.3:a:aws:bedrock-agentcore identifies the AWS-published Python package distributed as bedrock-agentcore on PyPI.
RemediationAI
Vendor-released patch: 1.6.1 - upgrade the bedrock-agentcore Python package to 1.6.1 or later (pip install --upgrade 'bedrock-agentcore>=1.6.1') and rebuild any container images, Lambda layers, or agent runtimes that bundle the SDK, as documented in the AWS security bulletin https://aws.amazon.com/security/security-bulletins/2026-044-aws/ and the PyPI release at https://pypi.org/project/bedrock-agentcore/1.6.1/. Until the upgrade is rolled out, restrict who can invoke install_packages() to trusted operators only, and validate package name inputs against a strict allowlist (e.g., ^[A-Za-z0-9_.-]+(==[A-Za-z0-9_.-]+)?$) before passing them through - note this will block legitimate version specifiers using extras or markers and any URL/VCS installs. As an additional compensating control, disable arbitrary package installation in the Code Interpreter sandbox or pre-bake required dependencies into the sandbox image, accepting the trade-off that agents lose dynamic dependency installation.
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