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Vulnerability record · CVE-2026-64825 · published 21 July 2026

CVE-2026-64825: Path traversal vulnerability

Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.__truediv__ to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.

9.0 CVSS 4.0 Critical EPSS 0.58% · top 54.5% CWE-22 · Path traversal Deferred
9.0CVSS 4.0 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
21 Jul 2026Last modified by NVD

Description

Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.__truediv__ to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752
https://github.com/home-assistant/core/pull/172368
https://github.com/home-assistant/core/releases/tag/2026.6.0
https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload

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Source: NIST National Vulnerability Database (record CVE-2026-64825), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.