# CVE-2026-12957: Arbitrary Code Execution in Language Servers for AWS

> CVE-2026-12957: Arbitrary Code Execution in Language Servers for AWS. CVSS 7.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-12957
Last updated: 2026-06-23T19:36:18Z

- Published: 2026-06-23 16:02 UTC · Updated: 2026-06-23 19:36 UTC · Assigner: AMZN
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 0.23%, 14th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-732

## 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.

## Affected vendors and products

- Amazon Web Services: Language Servers for AWS

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-12957)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-12957)
- [https://aws.amazon.com/security/security-bulletins/2026-047-aws/](https://aws.amazon.com/security/security-bulletins/2026-047-aws/)
- [https://github.com/aws/language-servers/security/advisories/GHSA-xhcr-j4j9-3gh7](https://github.com/aws/language-servers/security/advisories/GHSA-xhcr-j4j9-3gh7)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-12957 · Markdown: https://rewindex.com/cve/CVE-2026-12957.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-12957 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:17.216Z