CVE-2026-71284: Fledge IoT Gateway Backup Restore OS Command Injection via Tar Member Filename

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-05 · updated 2026-10-23
Weakness: CWE-78

Description

Fledge's backup-restore upload handler, upload_backup (python/fledge/services/core/api/backup_restore.py), takes the first extracted tar member's filename (tar_file_names[0]) and builds a shell command via string formatting. Because os.system invokes a shell and no quoting (shlex.quote, list-form subprocess) is applied, an admin uploading a crafted backup archive achieves arbitrary OS command execution.

Affected products

fledge-iot fledge: through 3.1.0

References

https://github.com/fledge-iot/fledge
https://github.com/fledge-iot/fledge/blob/main/python/fledge/services/core/api/backup_restore.py

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