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

Quick assessment

Affected
Amazon Web Services Language Servers for AWS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon Web Services Language Servers for AWS是美国Amazon Web Services公司的一款面向云环境的语言服务器。 Amazon Web Services Language Servers for AWS 1.69.0之前版本存在后置链接漏洞，该漏洞源于缺乏符号链接验证，可能导致在任意文件写入。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1053 · Scheduled Task/Job

Affected Version Matrix 1

VendorProduct Version RangeStatus
Amazon Web Services Language Servers for AWS < 1.69.0 affected
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I. Basic Information for CVE-2026-12958

Vulnerability Information
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Vulnerability Title
Arbitrary file write in Language Servers for AWS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon Web Services Language Servers for AWS 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon Web Services Language Servers for AWS是美国Amazon Web Services公司的一款面向云环境的语言服务器。 Amazon Web Services Language Servers for AWS 1.69.0之前版本存在后置链接漏洞，该漏洞源于缺乏符号链接验证，可能导致在任意文件写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Amazon Web Services Language Servers for AWS 0 ~ 1.69.0 -

II. Public POCs for CVE-2026-12958

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 12228 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-12958

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Vendor Advisories for CVE-2026-12958 (2)

IV. Related Vulnerabilities

Same product: Language Servers for AWS
Same vendor: Amazon Web Services
Same weakness: CWE-61

V. Comments for CVE-2026-12958

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