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CVE-2026-32746

critical

Description

telnetd in GNU inetutils through 2.7 allows an out-of-bounds write in the LINEMODE SLC (Set Local Characters) suboption handler because add_slc does not check whether the buffer is full.

References

https://labs.watchtowr.com/a-32-year-old-bug-walks-into-a-telnet-server-gnu-inetutils-telnetd-cve-2026-32746/

https://thehackernews.com/2026/03/critical-telnetd-flaw-cve-2026-32746.html

https://securityaffairs.com/189620/hacking/researchers-warn-of-unpatched-critical-telnetd-flaw-affecting-all-versions.html

https://www.openwall.com/lists/oss-security/2026/03/12/4

https://lists.gnu.org/archive/html/bug-inetutils/2026-03/msg00031.html

https://github.com/watchtowrlabs/watchtowr-vs-telnetd-CVE-2026-32746

http://www.openwall.com/lists/oss-security/2026/03/14/1

Details

Source: Mitre, NVD

Published: 2026-03-13

Updated: 2026-03-23

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.0004

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored