Slackware users running version 15.0 or the current branch should upgrade libpng to fix a medium severity security vulnerability. This update addresses use-after-free errors within specific functions that could potentially lead to corrupted chunk data and heap information disclosure. Additional hardening was applied to append-style setters to protect against theoretical variants of this same aliasing pattern during the patch process. You can download the corrected packages from the official FTP site or find additional mirrors near you on the main website before installing them as root.

libpng (SSA:2026-099-01)

libpng (SSA:2026-099-01)

libpng (SSA:2026-099-01)

New libpng 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/libpng-1.6.57-i586-1_slack15.0.txz: Upgraded.
Fixed a medium severity security issue:
Use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST`
leading to corrupted chunk data and potential heap information disclosure.
Also hardened the append-style setters (`png_set_text`, `png_set_sPLT`,
`png_set_unknown_chunks`) against a theoretical variant of the same
aliasing pattern.
For more information, see:
https://www.cve.org/CVERecord?id=CVE-2026-34757
(* 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/libpng-1.6.57-i586-1_slack15.0.txz

Updated package for Slackware x86_64 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/libpng-1.6.57-x86_64-1_slack15.0.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/libpng-1.6.57-i686-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/l/libpng-1.6.57-x86_64-1.txz

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

Slackware 15.0 package:
31ee3681a4e643fd2871cd18bf353c1d libpng-1.6.57-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
58103bf4878142d7cd45ffd3f64bdee5 libpng-1.6.57-x86_64-1_slack15.0.txz

Slackware -current package:
bcea1da0a9780feb0aa202122d5580b8 l/libpng-1.6.57-i686-1.txz

Slackware x86_64 -current package:
9219bce99534c8866a269ff72f7f3083 l/libpng-1.6.57-x86_64-1.txz

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

Upgrade the package as root:
# upgradepkg libpng-1.6.57-i586-1_slack15.0.txz

+-----+

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