Vulnerability · Published Oct 30, 2026 · Assigned by VulnCheck

CVE-2026-119560OPNsense core through 26.7.8 NTP Configuration Injection via GPS and PPS Fudge Fields

Medium 5.9

In plain English

A medium-severity security flaw in core from opnsense. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 71.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

OPNsense core through 26.7.8 contains a configuration injection vulnerability that allows authenticated users to append ntpd.conf directives by embedding newlines in the fudge and refid fields. Attackers holding the page-services-ntp-gps or PPS privilege can submit CR/LF characters via services_ntpd_gps.php or services_ntpd_pps.php to inject directives loaded by ntpd running as root.

Affected products (as reported)

Vendor	Product	Versions
opnsense	core	0 – through 26.7.8

Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L

References

https://github.com/opnsense/core/blob/26.7.8/src/etc/inc/plugins.inc.d/ntpd.inc#L285-L312 technical-description
https://github.com/opnsense/core/blob/26.7.8/src/www/services_ntpd_gps.php#L49 technical-description
GitHub Security Advisory (GHSA-fq94-cxvc-9r7w) related, vendor-advisory
https://abraxaslabs.tech/research/opnsense-ntp-gps-fudge third-party-advisory
https://github.com/opnsense/core product
VulnCheck Advisory: OPNsense core through 26.7.8 NTP Configuration Injection via GPS and PPS Fudge Fields third-party-advisory