Description
A flaw was found in MRTG. When the MRTG daemon is started as a root user and subsequently drops privileges, a local, low-privileged attacker can exploit a symbolic link (symlink) following vulnerability. By influencing or pre-placing a symlink in the process ID (PID) file path, the attacker can trick the root process into changing the ownership of an arbitrary existing file to the daemon user. This can lead to local privilege escalation, allowing unauthorized access to or modification of sensitive files.
References10
- access.redhat.com/errata/RHSA-2026:57596
- access.redhat.com/errata/RHSA-2026:57600
- access.redhat.com/errata/RHSA-2026:65832
- access.redhat.com/errata/RHSA-2026:87255
- access.redhat.com/errata/RHSA-2026:91644
- access.redhat.com/errata/RHSA-2026:91843
- access.redhat.com/errata/RHSA-2026:91844
- access.redhat.com/errata/RHSA-2026:91845
- access.redhat.com/errata/RHSA-2026:92051
- access.redhat.com/errata/RHSA-2026:92071
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 3 · as of 12 November 2026
- CWE
- CWE-59
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.