CVE-2026-12530 - Improper neutralization of argument delimiters in AWS Bedrock AgentCore Python SDK install_packages()

unknownCVE-2026-12530

Bulletin ID: 2026-044-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 06/17/2026 14:15 PM PDT Description: The AWS Bedrock AgentCore Python SDK (bedrock-agentcore) is an open-source SDK that enables developers to build, deploy, and manage agents on AWS Bedrock AgentCore. We identified CVE-2026-12530, an issue in the install_packages() method of the Code Interpreter client. The method applied an incomplete blocklist to sanitize package name arguments before constructing a 'pip install' shell command executed within the Code Interpreter sandbox. This allowed crafted package name arguments to bypass validation ‐ most critically, pip's '‐‐index‐url' flag, which could redirect package resolution to an third‐party‐controlled PyPI server, and the '-r' flag, which could read and expose arbitrary sandbox files. Impacted versions: AWS Bedrock AgentCore Python SDK (bedrock-agentcore) versions >= 1.1.3 and < 1.6.1 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: AWS product: AWS Bedrock AgentCore Python SDK Remote code execution

What: An incomplete blocklist in the install_packages() method allows crafted package name arguments to bypass validation.
Who is affected: Developers using the AWS Bedrock AgentCore Python SDK.
Urgency: Remediation is critical due to the potential for remote code execution.
Action: Update to the latest version of the AWS Bedrock AgentCore Python SDK.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: AWS Security Bulletins (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-044-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-125300.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-12530	coverage & exploitation status	NVD · CVE.org

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