CVE-2026-57155 OPNsense - Path Traversal & Remote Code Execution

OPNsense < 26.1.11 contains a path traversal in Firewall Alias GeoIP importer's process_zip() and process_gzip() caused by unvalidated CSV country_code, letting attackers with Firewall Alias Edit privilege write files as root and execute commands, exploit requires Firewall Alias Edit privilege.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
View the NVD record ↗

Details

Type
Path Traversal
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
15 October 2026
Updated
16 October 2026
Weakness
CWE-22

Vendor fix

Update to version 26.1.11 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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