tmux format_cb_pane_tabs Function Denial of Service Vulnerability [CVE-2018-19387]

CVE Number – CVE-2018-19387

A vulnerability in the format_cb_pane_tabs function of tmux could allow a local attacker to cause a denial of service (DoS) condition on a targeted system.The vulnerability exists in the format_cb_pane_tabs function, as defined in the format.c source code file of the affected software. An attacker could exploit the vulnerability by accessing a targeted system and executing an application that submits malicious input to the affected software. A successful exploit could trigger a NULL pointer dereference condition that causes the application to crash, resulting in a DoS condition.tmux has confirmed the vulnerability and released a software patch.


  • To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement may reduce the likelihood of a successful exploit.


  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to access local systems.

    Administrators are advised to allow only privileged users to access administration or management systems.

    Administrators are advised to monitor critical systems.

Vendor Announcements

  • tmux has released a bug report at the following link: #1547

Fixed Software

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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