CVE-2026-11393Network attack vector

Code execution via triple-quote docstring breakout

Published Jun 8, 2026 · Updated Jun 8, 2026

Code injection in Amazon Web Services AgentCore CLI 0.4.0 through 0.14.1 allows remote authenticated users to execute arbitrary Python code. The Bedrock Agent import translator inserts collaborationInstruction into a triple-quoted docstring in generated main.py while escaping only single quotes, allowing three double quotes to terminate the docstring and inject statements. Preview versions 0.3.0-preview.7.0 through 1.0.0-preview.8 are also affected; exploitation requires same-account bedrock:AssociateAgentCollaborator permission and another user to import and run or deploy the agent, exposing local credentials or the runtime IAM role.

CVSS severity8.8

High

EPSS probability0.34%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2026-11393
Published: Jun 8, 2026
Updated: Jun 8, 2026

Vendor: Amazon Web Services
Product: AgentCore CLI
Classifications: CWE-94, T1059.006

Attack vector: network
Privileges: authenticated

Timeline

How it unfolded

Jun 8, 2026CVE publishedPublication date reported by the CVE source.
Jun 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

Affected versionversion=0.3.0-preview.7.0 <=1.0.0-preview.8
Affected versionversion=0.4.0 <=0.14.1

What conditions does exploitation require?

Attack vectornetwork

Required privilegesauthenticated

What is affected?

Amazon Web Services · AgentCore CLIversion=0.3.0-preview.7.0 <=1.0.0-preview.8; version=0.4.0 <=0.14.1

Published CVSS scores

9.0Amazon Web ServicesCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

8.8Amazon Web ServicesCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026

Latest reporting daySep 16, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesauthenticated

Known exploitationUnconfirmed

Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')

T1059.006Command and Scripting Interpreter: Python

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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