Improper neutralization of argument delimiters in AWS Bedrock AgentCore Python SDK...

Bulletin ID: 2026-065-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 07/23/2026 13:00 PM PDT Description: The AWS Bedrock AgentCore Python SDK (bedrock-agentcore) provides tools for building AI agents, including a Code Interpreter client that installs Python packages into a managed sandbox. We identified CVE-2026-16796 , an improper neutralization of argument delimiters in the install_packages() method that might allow a remote authenticated user to execute arbitrary commands within the Code Interpreter sandbox via crafted package name arguments. Impacted versions:  bedrock-agentcore version Resolution: This issue has been addressed in bedrock-agentcore version 1.18.1 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: If you are not able to upgrade, do not pass untrusted or model-generated input to install_packages(). Applications that must accept dynamic package names should validate them against strict PyPI naming rules, including constraining any extras group to comma-separated identifiers, before calling the SDK. References: CVE-2026-16796 GHSA-j6g5-3hh3-pgw8 Acknowledgement: We would like to thank Sergio Garcia and BeyondTrust Phantom Labs for collaborating on this issue through the coordinated issue disclosure process. Please email aws-security@amazon.com with any security questions or concerns. "},"metadata":{"tags":[]}},{"fields":{"patternBoolean2":"false","id":"ams#rt-rich-textc2#pattern-data"},"metadata":{"tags":[{"name":"pattern-data","description":"Default pattern data","id":"ams#rt-rich-textc2#pattern-data","namespaceId":"rt-rich-text"}]}}]},"metadata":{"auth":{},"testAttributes":{}},"context":{"page":{"pageUrl":"https://aws.amazon.com/security/security-bulletins/2026-065-aws/"},"contentType":"page","environment":{"stage":"prod","region":"us-west-2"},"sdkVersion":"2.0.27"},"refMap":{"manifest.js":"cda3e8d042","rt-rich-text.js":"5043b0a87f","rt-rich-text.rtl.css":"6a04028f86","rt-rich-text.css":"98f5a6aee4","rt-rich-text.css.js":"3d619cc2e1","rt-rich-text.rtl.css.js":"ccdb945d3e"},"settings":{"templateMappings":{"patternHeading":"patternHeading","patternSubheading":"patternSubheading","patternDark":"patternBoolean2","title":"itemHeading","bodyText":"itemLongLoc"}}} CVE-2026-16796 - Improper neutralization of argument delimiters in AWS Bedrock AgentCore Python SDK install_packages() Bulletin ID: 2026-065-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 07/23/2026 13:00 PM PDT Description: The AWS Bedrock AgentCore Python SDK (bedrock-agentcore) provides tools for building AI agents, including a Code Interpreter client that installs Python packages into a managed sandbox. We identified CVE-2026-16796 , an improper neutralization of argument delimiters in the install_packages() method that might allow a remote authenticated user to execute arbitrary commands within the Code Interpreter sandbox via crafted package name arguments. Impacted versions:  bedrock-agentcore version Resolution: This issue has been addressed in bedrock-agentcore version 1.18.1 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: If you are not able to upgrade, do not pass untrusted or model-generated input to install_packages(). Applications that must accept dynamic package names should validate them against strict PyPI naming rules, including constraining any extras group to comma-separated identifiers, before calling the SDK. References: CVE-2026-16796 GHSA-j6g5-3hh3-pgw8 Acknowledgement: We would like to thank Sergio Garcia and BeyondTrust Phantom Labs for collaborating on this issue through the coordinated issue disclosure process. Please email aws-security@amazon.com with any security questions or concerns. {"data":{"items":[{"fields":{"footer":"{ "createAccountButtonLabel": "Create an AWS

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• aws.amazon.com/security/security-bulletins/rss/2026-065-aws/
• www.cve.org/CVERecord?id=CVE-2026-16796