CRITICAL 9.0 NVD
CVE-2026-53581
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 vu
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.
References
- https://github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m
- https://github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m
This critical severity vulnerability with a CVSS score of 9.0 was published on 2026-09-08 via NVD.
Risk Timeline
CVE Disclosed2026-09-08 · 2 days ago
Remediation Resources
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