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CVE-2026-53581 Details

Description

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and force the system to write user-controlled data to any file on the filesystem. Version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core patch the issue.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:9 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m	CISA-ADP
https://github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	[email protected]
CWE-73	External Control of File Name or Path	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 9, 2026	CVE Modified	CISA-ADP
Sep 8, 2026	New CVE Received	[email protected]