CVE-2026-72694

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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.

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The Multi Router Traffic Grapher (MRTG) monitors the traffic load on network connections. MRTG generates HTML pages containing PNG images which provide a live visual representation of this traffic.

Security Fix(es):

• mrtg: MRTG daemon symlink-following chown allows local privilege escalation via PID file path manipulation (CVE-2026-72694)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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.

• CVE-2026-72694: refuse a symbolic link at the pid file path, create the file with O_CREAT|O_EXCL and chown the open handle rather than the path. Started as root in daemon mode, mrtg created and chowned the pid file before dropping privileges, so a pre-placed symlink could have root chown an arbitrary file to the daemon user.