CVE-2026-12957

Arbitrary Code Execution in Language Servers for AWS

Published Jun 23, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Description
Improper trust boundary enforcement in Language Servers for AWS before version 1.65.0 on all supported platforms may allow a for arbitrary code execution. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically executed. This issue requires the user to trust the workspace when prompted.



To remediate this issue, users should upgrade to Language Servers for AWS version 1.65.0 or higher.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-xhcr-j4j9-3gh7 Language Servers for AWS Vulnerable to Arbitrary Code Execution
History
Type Values Removed Values Added
First Time appeared Amazon
Amazon language Servers For Aws
Vendors & Products Amazon
Amazon language Servers For Aws
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper trust boundary enforcement in Language Servers for AWS before version 1.65.0 on all supported platforms may allow a for arbitrary code execution. If a local user opens a maliciously crafted workspace, any commands within the project configuration files may be automatically executed. This issue requires the user to trust the workspace when prompted. To remediate this issue, users should upgrade to Language Servers for AWS version 1.65.0 or higher.
Title Arbitrary Code Execution in Language Servers for AWS
Weaknesses CWE-732
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, '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

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Jun 23, 2026, 5:50 PM
Reserved
Jun 23, 2026, 1:55 AM
Status
Awaiting Analysis
Published
Jun 23, 2026, 5:16 PM
Modified
Oct 26, 2026, 11:10 AM