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[USN-7992-2] Inetutils vulnerability

Posted on 18 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7992-2
February 18, 2026

inetutils vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Inetutils could allow unintended access to network services.

Software Description:
- inetutils: Collection of common network programs

Details:

USN-7992-1 fixed vulnerabilities in telnetd in Inetutils. This update
provides the corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,
and Ubuntu 20.04 LTS.

Original advisory details:

Kyu Neushwaistein discovered that telnetd in Inetutils incorrectly handled
certain environment variables. A remote attacker could use this issue to
bypass authentication and open a session as an administrator.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
inetutils-telnetd 2:1.9.4-11ubuntu0.2+esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
inetutils-telnetd 2:1.9.4-3ubuntu0.1+esm4
Available with Ubuntu Pro

Ubuntu 16.04 LTS
inetutils-telnetd 2:1.9.4-1ubuntu0.1~esm5
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7992-2
https://ubuntu.com/security/notices/USN-7992-1
CVE-2026-24061

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