Improper Trust Boundary Enforcement in Language Servers for AWS
CVE-2026-12957

8.5HIGH

Key Information:

Vendor

Amazon Web Services

Status
Language Servers For Aws
Vendor
CVE Published:
23 June 2026

What is CVE-2026-12957?

An improper trust boundary enforcement vulnerability in Language Servers for AWS prior to version 1.65.0 can allow arbitrary code execution. This occurs when a local user opens a maliciously crafted workspace, potentially leading to the automatic execution of commands contained within the project's configuration files. Users must exercise caution and ensure they trust the workspace when prompted, as the exploitation of this vulnerability can result in significant security concerns. To mitigate this risk, upgrading to Language Servers for AWS version 1.65.0 or higher is strongly recommended.

Affected Version(s)

Language Servers for AWS 0 < 1.65.0

References

https://aws.amazon.com/security/security-bulletins/2026-0...
vendor-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.