Fledge-IoT Fledge up to 3.1.0 Backup-Restore Upload backup_restore.py upload_backup tar_file_names os command injection

Summaryinfo

A vulnerability categorized as problematic has been discovered in Fledge-IoT Fledge up to 3.1.0. This affects the function upload_backup of the file python/fledge/services/core/api/backup_restore.py of the component Backup-Restore Upload Handler. Executing a manipulation of the argument tar_file_names can lead to os command injection. This vulnerability is tracked as CVE-2026-71284. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Fledge-IoT Fledge up to 3.1.0 and classified as problematic. This vulnerability affects the function upload_backup of the file python/fledge/services/core/api/backup_restore.py of the component Backup-Restore Upload Handler. The manipulation of the argument tar_file_names with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-71284 since 08/05/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/05/2026). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Fledge-IoT

Name

• Fledge

Version

• 3.0
• 3.1.0

CPE 2.3info

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CPE 2.2info

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