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CVE-2026-12958

Arbitrary file write in Language Servers for AWS

Published: Jun 23, 2026Updated: Jun 23, 2026 Sources: CVE List NVDCWE-61
7.8HIGH
NVD MITRE
EPSS Score
0.1%
Top 96.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

In plain language

AI Worth attention

Language Servers for AWS can be tricked into writing files anywhere on your computer when you open a workspace containing a malicious link; if your team uses this tool, you should update to the fixed version.

Executive summary

In Language Servers for AWS, a missing symlink validation allows arbitrary file write outside the workspace trust boundary when a user opens a malicious workspace that contains symlinks resolving to paths outside the trusted directory.

If affected, business impact
Malicious files written on endpointsCloud credential or API key theftDeveloper environment compromiseWork disruption from altered files

What to do now

  1. Check which version of Language Servers for AWS is installed in your developer environment.
  2. If it’s older than 1.69.0, upgrade to Language Servers for AWS 1.69.0 or higher.
  3. If you can’t upgrade right away, avoid opening untrusted repositories/workspaces that could contain malicious symlinks.
Usually a quick update

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-61

Affected Products

Amazon Web Services
commercialaka aws
Language Servers for AWSSaaS
Cloud & SaaS / cloud-platform

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://aws.amazon.com/security/security-bulletins/2026-047-aws/
aws.amazon.com
https://github.com/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5
github.com
News mentions
2

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