CVE-2026-12957

Arbitrary Code Execution in Language Servers for AWS

State: Published
Severity: 8.5 High
Published: Jun 23, 2026
Updated: Jun 23, 2026
Reserved: Jun 23, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.5 High	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	AMZN
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	AMZN

Weaknesses

CWE-732 Incorrect Permission Assignment for Critical Resource

Affected Products

Product	Versions
Language Servers for AWSAmazon Web Services	before 1.65.0Affected

References

https://aws.amazon.com/security/security-bulletins/2026-047-aws/vendor-advisory
https://github.com/aws/language-servers/security/advisories/GHSA-xhcr-j4j9-3gh7third-party-advisory

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