From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] telnet (SSA:2026-059-02)
Date: Sat, 28 Feb 2026 15:29:33 -0800 (PST)





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[slackware-security] telnet (SSA:2026-059-02)

New telnet packages are available for Slackware 15.0 and -current to
fix a security issue.


Here are the details from the Slackware 15.0 ChangeLog:
+--------------------------+
patches/packages/telnet-0.17-i586-7_slack15.0.txz: Rebuilt.
This update fixes a security issue:
The nextitem() function in telnetd/utility.c has no bounds checking in the SB
(suboption) case. The for(;;) loop scans past nfrontp into uncontrolled
memory. This can be exploited by an unauthenticated remote attacker to
execute arbitrary code on the server running telnetd.
Please note that while telnet itself is a useful utility for network testing,
telnetd is a legacy application which should generally not be used. If it is
used, it should be used only on isolated networks where there is no
expectation of security.
Thanks to r1w1s1.
For more information, see:
https://www.cve.org/CVERecord?id=CVE-2020-10188
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project! :-)

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/telnet-0.17-i586-7_slack15.0.txz

Updated package for Slackware x86_64 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/telnet-0.17-x86_64-7_slack15.0.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/telnet-0.17-i686-8.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/telnet-0.17-x86_64-8.txz


MD5 signatures:
+-------------+

Slackware 15.0 package:
10eb364f2d249ba78d42246d930b3508 telnet-0.17-i586-7_slack15.0.txz

Slackware x86_64 15.0 package:
ba5efc35508d71ba7b4a6ddddeb6437d telnet-0.17-x86_64-7_slack15.0.txz

Slackware -current package:
4ec614b7b2b62d09c7fcd3d06f0534ad n/telnet-0.17-i686-8.txz

Slackware x86_64 -current package:
919b8efee781d7ab4b5587d8e0457368 n/telnet-0.17-x86_64-8.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg telnet-0.17-i586-7_slack15.0.txz


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com

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