CVE-2026-53581 OPNsense - Path Traversal

OPNsense < 26.1.9 (opnsense/core) and < 26.4_20 (BE/opnsense/core) contain a path traversal caused by manipulation of GPS or PPS serial port parameters in the NTP configuration module, letting attackers with NTP config access overwrite arbitrary files as root.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-22

Vendor fix

Update to opnsense/core version 26.1.9 and BE/opnsense/core version 26.4_20 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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