GitHub Advisoryadvisory · npm

GHSA-xhcr-j4j9-3gh7 Language Servers for AWS Vulnerable to Arbitrary Code Execution

HIGH Published 2026-09-24 Modified 2026-09-24 Official page ↗
Aliases
CVE-2026-12957
Ecosystem
npm
Packages
@aws/lsp-codewhisperer
Severity
High
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-732
Reviewed
2026-09-24

Affected packages

• npm @aws/lsp-codewhisperer: < 0.0.113 → fixed in 0.0.113

Description

Summary Language Servers for AWS (the aws/language-servers project) provide the underlying language-server runtime that powers Amazon Q Developer's AI coding assistance across its IDE plugins (Visual Studio Code, JetBrains, Eclipse, and Visual Studio). Improper trust boundary enforcement in Language Servers for AWS may allow for arbitrary code execution. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically executed. Impact When a local user opens a maliciously crafted workspace and trusts it when prompted, commands defined in the workspace's project-level configuration files may be executed automatically, resulting in arbitrary code execution on the user's host. This issue is triggered when a user opens a workspace, trusts it, and the agent subsequently executes commands defined in the project-level configuration files. Impacted versions: Language Servers for AWS version <1.65.0. Patches This issue has been addressed in Language Servers for AWS version 1.65.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds No workarounds are available. References If you have any questions or comments about this advisory, AWS Security asks that you contact them via their vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue. Acknowledgement AWS Security would like to thank Wiz and Maor Dokhanian for collaborating on this issue through the coordinated vulnerability disclosure process.

Related

Alias · CVE (1)

  • CVE-2026-12957 Improper trust boundary enforcement in Language Servers for AWS before version 1.65.0 on all supported platforms may allow a for arbitrary… vulnerability

Weakness · CWE (1)

  • CWE-732 Incorrect Permission Assignment for Critical Resource weakness

References