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CVE-2026-53456— Blueprint Studio terminal SSH private key written to disk

Quick assessment

Affected
ha-china blueprint-studio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Home Assistant Blueprint Studio是Home Assistant组织的一个文件编辑器。 Home Assistant Blueprint Studio 2.5.2之前版本存在信任管理问题漏洞，该漏洞源于custom_components/blueprint_studio/backend/terminal_manager.py中SSH密钥认证在应用限制权限前将私钥写入文件，且依赖尽力清理，可能导致私钥残留，具有文件系统访问权限的用户或进程能够获取残留私钥。

CVSS 5.6 · Medium EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
ha-china blueprint-studio < 2.5.2 affected
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I. Basic Information for CVE-2026-53456

Vulnerability Information
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Vulnerability Title
Blueprint Studio terminal SSH private key written to disk
Source: CVE Program / CVE List V5
Vulnerability Description
Blueprint Studio is a VS Code-like file editor for Home Assistant configuration files. Prior to 2.5.2, Blueprint Studio terminal SSH key authentication in custom_components/blueprint_studio/backend/terminal_manager.py wrote SSH private-key material to a file under the Home Assistant configuration directory before applying restrictive permissions and relied on best-effort cleanup. The key could temporarily remain on disk and could persist if cleanup failed or Home Assistant crashed. A user or process with filesystem access to the Home Assistant configuration directory could obtain the residual private key. This issue is fixed in version 2.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5
Vulnerability Title
Home Assistant Blueprint Studio 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Home Assistant Blueprint Studio是Home Assistant组织的一个文件编辑器。 Home Assistant Blueprint Studio 2.5.2之前版本存在信任管理问题漏洞，该漏洞源于custom_components/blueprint_studio/backend/terminal_manager.py中SSH密钥认证在应用限制权限前将私钥写入文件，且依赖尽力清理，可能导致私钥残留，具有文件系统访问权限的用户或进程能够获取残留私钥。
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
ha-china blueprint-studio < 2.5.2 -

II. Public POCs for CVE-2026-53456

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III. Intelligence Information for CVE-2026-53456

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Patches & Fixes for CVE-2026-53456 (2)

Vendor Advisories for CVE-2026-53456 (1)

Same Patch Batch · ha-china · 2026-08-18 · 6 CVEs total

CVE-2026-53453 8.7 HIGH Blueprint Studio API authorization bypass for non-admin Home Assistant users
CVE-2026-53455 8.6 HIGH Blueprint Studio Git credential helper command injection
CVE-2026-53454 6.9 MEDIUM Blueprint Studio stored Git credentials in plaintext Git credential store
CVE-2026-53458 5.3 MEDIUM Blueprint Studio API exposed internal exception details
CVE-2026-53457 5.1 MEDIUM Blueprint Studio terminal command working directory not bounded to config directory

IV. Related Vulnerabilities

Same product: blueprint-studio
Same vendor: ha-china
Same weakness: CWE-522

V. Comments for CVE-2026-53456

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