SSH key disclosure via residual key file
Published Aug 18, 2026 · Updated Aug 19, 2026
Credential exposure in Blueprint Studio before 2.5.2 allows local users to read an SSH private key from residual files on disk. In custom_components/blueprint_studio/backend/terminal_manager.py, terminal SSH key authentication writes supplied private-key material to a file in the Home Assistant configuration directory, applies restrictive permissions only after creation, and relies on best-effort cleanup instead of keeping the key in memory. Exposure requires filesystem access to that directory, and the key can remain available if cleanup fails or Home Assistant crashes.
Summary
What happened
Credential exposure in Blueprint Studio before 2.5.2 allows local users to read an SSH private key from residual files on disk. In custom_components/blueprint_studio/backend/terminal_manager.py, terminal SSH key authentication writes supplied private-key material to a file in the Home Assistant configuration directory, applies restrictive permissions only after creation, and relies on best-effort cleanup instead of keeping the key in memory. Exposure requires filesystem access to that directory, and the key can remain available if cleanup fails or Home Assistant crashes.
The record
- CVE
- CVE-2026-53456
- Published
- Aug 18, 2026
- Updated
- Aug 19, 2026
- Vendor
- Home Assistant China
- Product
- Blueprint Studio
- Classifications
- CWE-522, T1552.004
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 2.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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