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CVE-2026-64825

Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload

9.0 CriticalFix available

CVE-2026-64825 is a critical vulnerability (CVSS 9.0) in Home-assistant Home Assistant Core, published July 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 47th percentile. Fixed in homeassistant 2026.6.0.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
Low

Exploit likelihood

0.58%Up 0.1 points since Jul 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.0

Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload

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.

Record
CVE-2026-64825
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2026-46301 9.0

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.

Record
EUVD-2026-46301
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-5hxg-r395-fqxx 9.0

Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding

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.

Record
GHSA-5hxg-r395-fqxx
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Weakness
CWE-22
Updated
2026-11-02
NVD 9.0

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.

Record
CVE-2026-64825
CVSS 4.0
9.0 CriticalCVSS: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:X/V:X/RE:X/U:X
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Weakness
CWE-22
Updated
2026-11-02
OSV 9.0

Home Assistant Core < 2026.6.0 Path Traversal File Write via Backup Upload

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.

Record
CVE-2026-64825
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
Weakness
CWE-22
Updated
2026-11-02
OSVGHSA-5hxg-r395-fqxx 9.0

Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding

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.

Record
GHSA-5hxg-r395-fqxx
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Weakness
CWE-22
Updated
2026-11-02
OSVPYSEC-2026-3669 9.0

Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding

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.

Record
PYSEC-2026-3669
CVSS 4.0
9.0 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
CVSS 3.1
9.3 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
homeassistant
PyPI
 before 2026.6.0
2026.6.0
homeassistant
PyPI
 before 2026.6.0, plus listed versions
0.10.00.10.10.100.00.100.0b00.100.0b1
Show 45 moreShow less
0.100.0b20.100.0b30.100.10.100.20.100.30.101.00.101.0b00.101.0b10.101.0b20.101.0b30.101.0b40.101.10.101.20.101.30.102.00.102.0b00.102.0b10.102.0b20.102.0b30.102.10.102.20.102.30.103.00.103.0b00.103.0b10.103.10.103.20.103.30.103.40.103.50.103.60.104.00.104.0b00.104.0b10.104.0b20.104.0b30.104.0b40.104.0b50.104.10.104.20.104.30.105.00.105.0b00.105.0b50.105.0b6
2026.6.0

History

History
WhenChangedSources
2026-11-02createdCVE List, EUVD, GitHub Advisories, NVD, OSV

References

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