CVE-2026-11393 Code injection via improper triple-quote escaping in AgentCore CLI Bedrock Agent import
Authenticated attackers can execute arbitrary code via crafted collaboration instructions during agent import, affecting AWS AgentCore Runtime and local environments.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-11393?
CVE-2026-11393 is a high-severity code injection vulnerability in AWS AgentCore CLI, published on 8 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-11393?
6 open source packages ship an affected version, including @aws/agentcore.
| Package | Affected | Fixed in |
|---|---|---|
@aws/agentcore npm | From 0.3.0-preview.7.0 to 0.3.0-preview.9.0 | None |
@aws/agentcore npm | From 0.3.0-preview.7.0 to 0.3.0-preview.9.0 | None |
@aws/agentcore npm | From 0.4.0 | 0.14.2 |
@aws/agentcore npm | From 0.4.0 | 0.14.2 |
@aws/agentcore npm | From 1.0.0-preview.1 | 1.0.0-preview.9 |
@aws/agentcore npm | From 1.0.0-preview.1 | 1.0.0-preview.9 |
How do I fix CVE-2026-11393?
Upgrade @aws/agentcore to a fixed version for your release line: 0.14.2 or 1.0.0-preview.9.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-11393 being exploited?
There is no known exploitation of CVE-2026-11393 in the wild and no public exploit code.
Sources
Also known as GHSA-m4x6-gwgp-4pm7.