CVE-2026-71284

Summary

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: cmd = "cp {} {}".format(source, backup_path); ret_code = os.system(cmd). The only pre-check on the filename is a prefix/suffix match (startswith(backup_prefix), endswith(valid_extensions)), which a name such as fledge_backup_$(id>/tmp/pwn).db satisfies while still injecting a shell command substitution. 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 Software

Weaknesses

• CWE-78: CWE-78

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

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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