------------------------------------------------------------------------- Debian LTS Advisory DLA-4527-1 [email protected] https://www.debian.org/lts/security/ Andreas Henriksson April 11, 2026 https://wiki.debian.org/LTS -------------------------------------------------------------------------
Package : inetutils
Version : 2:2.0-1+deb11u4
CVE ID : CVE-2026-28372 CVE-2026-32746 CVE-2026-32772
Debian Bug : 1130741 1130742
Several vulnerabilities were discovered in the inetutils implementation
of telnetd and telnet, which may result in privilege escalation or
information disclosure.
CVE-2026-28372
Ron Ben Yizhak from SafeBreach found that the fix for CVE-2026-24061 was
not complete and can be exploited by abusing systemd service credentials
support added to the login(1) implementation of util-linux in release 2.40.
While Debian bullseye does not include util-linux 2.40 this problem does
thus not affect it, but was still addressed in case someone manually
updates util-linux and thus exposes this vulnerability.
CVE-2026-32746
Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel
of DREAM Security Research Team found that the telnetd server has a buffer
overflow in the LINEMODE SLC (Set Local Characters) suboption handler.
This can lead to potential pre-login remote code execution.
CVE-2026-32772
Justin Swartz discovered that telnet allows servers to read arbitrary
environment variables from clients via NEW_ENVIRON SEND USERVAR.
This can lead to information disclosure.
For Debian 11 bullseye, these problems have been fixed in version
2:2.0-1+deb11u4.
We recommend that you upgrade your inetutils packages.
For the detailed security status of inetutils please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/inetutils
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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