Bug#1144393: mrtg: CVE-2026-72694

Source: mrtg
X-Debbugs-CC: [email protected]
Severity: grave
Tags: security

Hi,

The following vulnerability was published for mrtg.

CVE-2026-72694[0]:
| 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.

https://bugzilla.redhat.com/show_bug.cgi?id=2460973
Fixed by: https://github.com/oetiker/mrtg/commit/30e19216bfadc0148f347cb0a42fd5e2016e6269


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-72694
    https://www.cve.org/CVERecord?id=CVE-2026-72694

Please adjust the affected versions in the BTS as needed.