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CVE-2026-11393: Code injection via improper triple-quote escaping in AgentCore CLI Bedrock Agent import

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-94

Description

Improper neutralization of triple-quote characters during Python code generation in AgentCore CLI before v0.14.2 might allow an authenticated remote threat actor to execute arbitrary code on AWS AgentCore Runtime under the imported agent's IAM execution role and on the local environment of another user in the same AWS account, via a crafted collaborationInstruction stored on a Bedrock Agent collaborator and later processed by that other user during agent import. To remediate this issue, users should upgrade to version 0.14.2.

Affected products

• AWS AgentCore CLI: from 0.4.0 through 0.14.1; from 0.3.0-preview.7.0 through 1.0.0-preview.8

References

• https://aws.amazon.com/security/security-bulletins/2026-040-aws/
• https://github.com/aws/agentcore-cli/releases/tag/v0.14.2
• https://github.com/aws/agentcore-cli/security/advisories/GHSA-m4x6-gwgp-4pm7
• https://www.npmjs.com/package/@aws/agentcore/v/0.14.2
• https://www.npmjs.com/package/@aws/agentcore/v/1.0.0-preview.9

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