{"id":"CVE-2026-16796","aliases":["GHSA-j6g5-3hh3-pgw8"],"title":"AWS Bedrock AgentCore: Improper neutralization of argument delimiters in the Python SDK install_packages()","summary":"AWS Bedrock AgentCore: Improper neutralization of argument delimiters in the Python SDK install_packages()","severity":"high","cvss":7.3,"cwe":["CWE-88"],"vendor":"bedrock-agentcore","product":"bedrock-agentcore","ecosystem":"pip","affected":["bedrock-agentcore < 1.18.1"],"patched":["bedrock-agentcore 1.18.1"],"published":"2026-07-24","updated":"2026-07-24","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-j6g5-3hh3-pgw8","references":[{"url":"https://github.com/aws/bedrock-agentcore-sdk-python/security/advisories/GHSA-j6g5-3hh3-pgw8"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16796"},{"url":"https://github.com/aws/bedrock-agentcore-sdk-python/pull/581"},{"url":"https://github.com/aws/bedrock-agentcore-sdk-python/commit/3c4b4ee6b8730e6313a82c743ac37dbcc1c21cdb"},{"url":"https://aws.amazon.com/security/security-bulletins/2026-065-aws"},{"url":"https://pypi.org/project/bedrock-agentcore/1.18.1"},{"url":"https://github.com/advisories/GHSA-j6g5-3hh3-pgw8"}],"tags":["ghsa","pip"],"epss":0.00725,"epssPercentile":0.52641,"ingestedAt":"2026-07-24T22:40:26.272Z","slug":"CVE-2026-16796","body":"## Overview\n\n### Summary\n\nThe 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. An issue exists where, under certain circumstances, improper neutralization of argument delimiters in the install_packages() method allows a remote authenticated user to execute arbitrary commands within the Code Interpreter sandbox via crafted package name arguments.\n\n### Impact\nInsufficient input validation in install_packages() allows specially crafted package specifiers to bypass validation and achieve arbitrary command execution within the sandbox. A remote authenticated user who can influence the arguments to install_packages() can execute arbitrary commands within the Code Interpreter sandbox environment.\n\n### Impacted Versions\n< 1.18.1\n\n### Patches\nThis 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.\n\n### Workarounds\nIf 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.\n\n### References\nIf you have any questions or comments about this advisory, AWS asks that you contact AWS Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n### Acknowledgement\n\nAWS would like to thank Sergio Garcia (@MrCloudSec) for collaborating on this issue through the coordinated issue disclosure process.\n\n## Affected packages\n\n- `bedrock-agentcore < 1.18.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `bedrock-agentcore 1.18.1`","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}