What is CVE-2026-12957?

CVE-2026-12957 is a high-severity vulnerability in Amazon Web Services Language Servers For AWS, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2026-06-23.

How severe is CVE-2026-12957?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Amazon Web Services Language Servers For AWS

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 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.

EPSS: 0.002 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Amazon Web Services Language Servers For Aws — versions 0

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-12957?: CVE-2026-12957 is a high-severity vulnerability in Amazon Web Services Language Servers For AWS, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2026-06-23.
How severe is CVE-2026-12957?: High severity. CVSS v3 base score is 7.8 out of 10.