{"id":"PYSEC-2026-3551","summary":"AWS Bedrock AgentCore: Improper neutralization of argument delimiters in the Python SDK install_packages()","details":"### 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\u003c 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.","aliases":["CVE-2026-16796","GHSA-j6g5-3hh3-pgw8"],"modified":"2026-08-04T14:30:15.015116953Z","published":"2026-08-04T11:34:43.653094Z","references":[{"type":"WEB","url":"https://github.com/aws/bedrock-agentcore-sdk-python/security/advisories/GHSA-j6g5-3hh3-pgw8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16796"},{"type":"WEB","url":"https://github.com/aws/bedrock-agentcore-sdk-python/pull/581"},{"type":"WEB","url":"https://github.com/aws/bedrock-agentcore-sdk-python/commit/3c4b4ee6b8730e6313a82c743ac37dbcc1c21cdb"},{"type":"WEB","url":"https://aws.amazon.com/security/security-bulletins/2026-065-aws"},{"type":"PACKAGE","url":"https://github.com/aws/bedrock-agentcore-sdk-python"},{"type":"WEB","url":"https://pypi.org/project/bedrock-agentcore/1.18.1"},{"type":"PACKAGE","url":"https://pypi.org/project/bedrock-agentcore"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-j6g5-3hh3-pgw8"}],"affected":[{"package":{"name":"bedrock-agentcore","ecosystem":"PyPI","purl":"pkg:pypi/bedrock-agentcore"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.1"}]}],"versions":["0.0.1","0.1.0","0.1.1","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.1.7","1.0.0","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.10.0","1.11.0","1.12.0","1.13.0","1.14.0","1.14.1","1.15.0","1.15.1","1.16.0","1.17.0","1.18.0","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.3.3","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.5.0","1.5.1","1.6.0","1.6.1","1.6.2","1.6.3","1.6.4","1.7.0","1.8.0","1.9.0","1.9.1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/bedrock-agentcore/PYSEC-2026-3551.yaml"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"},{"type":"CVSS_V4","score":"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"}]}