From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] c-ares (SSA:2026-293-01)
Date: Tue, 20 Oct 2026 17:50:53 -0700 (PDT)





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[slackware-security] c-ares (SSA:2026-293-01)

New c-ares packages are available for Slackware 15.0 and -current to
fix security issues.


Here are the details from the Slackware 15.0 ChangeLog:
+--------------------------+
patches/packages/c-ares-1.34.9-i586-1_slack15.0.txz: Upgraded.
This update fixes security issues:
Memory corruption when an application cancels its lookups after a connection
failure.
A DNS reply that arrived from a different server than the one queried could
be accepted.
Use-after-free of a lookup after shutting down a failed connection.
Use-after-free when an application cancels lookups from a callback, or shuts
a channel down.
Use-after-free of a connection after the socket-state callback returns.
Use-after-free when an application cancels lookups from a server-state
callback.
Use-after-free of a server record when an application changes its DNS
servers from a callback.
Use-after-free of a cached DNS answer while the application is still reading
it.
Buffer overflow when `ares_dup()` or `ares_save_options()` runs while
another thread changes the servers.
Uninitialized memory returned for a numeric IPv6 name with a prefix length.
The query cache could return an answer obtained using different EDNS
options.
For more information, see:
https://github.com/c-ares/c-ares/security/advisories/GHSA-wpr3-8q3r-4q8c
https://github.com/c-ares/c-ares/security/advisories/GHSA-fqh5-3x7m-wp44
https://github.com/c-ares/c-ares/security/advisories/GHSA-97vq-4mxv-7vhm
https://github.com/c-ares/c-ares/security/advisories/GHSA-rf6g-ww74-97qh
https://github.com/c-ares/c-ares/security/advisories/GHSA-mw23-pfg6-2x9r
https://github.com/c-ares/c-ares/security/advisories/GHSA-v33j-65h4-4ch8
https://github.com/c-ares/c-ares/security/advisories/GHSA-pj7p-v3cw-hq66
https://github.com/c-ares/c-ares/security/advisories/GHSA-grv7-fq5q-9vfc
https://github.com/c-ares/c-ares/security/advisories/GHSA-ph6c-3cvx-mq6v
https://github.com/c-ares/c-ares/security/advisories/GHSA-cfcv-8v2j-qj6r
https://github.com/c-ares/c-ares/security/advisories/GHSA-wrgc-prmw-27xh
(* 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/c-ares-1.34.9-i586-1_slack15.0.txz

Updated package for Slackware x86_64 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/c-ares-1.34.9-x86_64-1_slack15.0.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/c-ares-1.34.9-i686-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/c-ares-1.34.9-x86_64-1.txz


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

Slackware 15.0 package:
6bf61dedddd45ea548df95edaecbc983 c-ares-1.34.9-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
c9f3b230d9c18b3ff25f8d21c70c27a0 c-ares-1.34.9-x86_64-1_slack15.0.txz

Slackware -current package:
07cf19d8c0197c787e23f40ab8f77c85 n/c-ares-1.34.9-i686-1.txz

Slackware x86_64 -current package:
7c87a5b6b1309391bfe875958bd07f92 n/c-ares-1.34.9-x86_64-1.txz


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

Upgrade the package as root:
# upgradepkg c-ares-1.34.9-i586-1_slack15.0.txz


+-----+

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

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