From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] mutt (SSA:2026-186-01)
Date: Sun, 5 Jul 2026 14:38:43 -0700 (PDT)





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[slackware-security] mutt (SSA:2026-186-01)

New mutt 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/mutt-2.4.1-i586-1_slack15.0.txz: Upgraded.
This update fixes a security issue:
Prevent unsigned int overflow in imap_cmd_step buffer growth.
The idata->blen field is unsigned int (32-bit) while the companion
variable len is size_t (64-bit on LP64). When a malicious IMAP server
sends a response line longer than UINT_MAX bytes without newline, the
expression wraps to a small value, causing safe_realloc() to shrink the
buffer while len retains its original huge value. The subsequent
mutt_socket_readln() then writes far past the shrunken allocation.
Fix by changing idata->blen from unsigned int to size_t, matching the
type of len and preventing the overflow on all platforms.
(* 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/mutt-2.4.1-i586-1_slack15.0.txz

Updated package for Slackware x86_64 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/mutt-2.4.1-x86_64-1_slack15.0.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/mutt-2.4.1-i686-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/mutt-2.4.1-x86_64-1.txz


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

Slackware 15.0 package:
f11f2ee43019a8d4dfe091b9847edb26 mutt-2.4.1-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
4ec2b1a46429b01ba5cd0802ade731f2 mutt-2.4.1-x86_64-1_slack15.0.txz

Slackware -current package:
2118fea459aa2b9f2189234c4d915606 n/mutt-2.4.1-i686-1.txz

Slackware x86_64 -current package:
e6718228d75941323740361ca6a90114 n/mutt-2.4.1-x86_64-1.txz


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

Upgrade the package as root:
# upgradepkg mutt-2.4.1-i586-1_slack15.0.txz


+-----+

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

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