CVE-2026-24061

Publication date 21 January 2026

Last updated 21 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
inetutils	25.10 questing	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Notes

mdeslaur

This vulnerability is in the telnetd server. telnetd is insecure by design and it is highly recommended to not use it. The inetutils-telnetd package is in universe.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
inetutils	Upstream: fd702c0 Upstream: ccba9f7

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H