Vulnerability · Published Jun 23, 2026 · Assigned by AMZN

CVE-2026-12958Arbitrary file write in Language Servers for AWS

High 7.8

In plain English

A high-severity security flaw in Language Servers for AWS from Amazon Web Services. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.2%top 91.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Missing symlink validation in Language Servers for AWS may allow an arbitrary file write outside of the workspace trust boundary. This may occur when a local user opens a workspace with a maliciously crafted symlink that resolves to a file path outside the workspace trust boundary. To remediate this issue, users should upgrade to version 1.69.0 or higher.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@aws/lsp-codewhisperer	0.0.117	GHSA-6v3r-4p5c-mrp5

Affected products (as reported)

Vendor	Product	Versions
Amazon Web Services	Language Servers for AWS	0 – before 1.69.0

Weakness: CWE-61 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://aws.amazon.com/security/security-bulletins/2026-047-aws/ vendor-advisory
https://github.com/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5 third-party-advisory