About:
zlib is designed to be a free, general-purpose, legally unencumbered, lossless data-compression library for use on virtually any computer hardware and operating system. The zlib data format is itself portable across platforms. Unlike the LZW compression method used in Unix compress(1), the compression method currently used in zlib essentially never expands the data. (LZW can double or triple the file size in extreme cases.) zlib's memory footprint is also independent of the input data and can be reduced, if necessary, at some cost in compression.

Release focus: Major security fixes

Changes:
A potential security vulnerability when decoding invalid compressed data was eliminated. A potential security vulnerability when decoding specially crafted compressed data was eliminated. A bug when decompressing dynamic blocks with no distance codes was fixed. A CRC check bug in gzread() after gzungetc() was fixed. An error is no longer returned when using gzread() on an empty file.

Author:
Jean-loup Gailly [contact developer]

Rating:	reset 1 2 3 4 5 6 7 8 9 10
8.59/10.00 (22 votes)

Homepage:
http://www.zlib.net/
Tar/GZ:
http://www.zlib.net/zlib-1.2.3.tar.gz
Tar/BZ2:
http://www.zlib.net/zlib-1.2.3.tar.bz2
Zip:
http://www.zlib.net/zlib123.zip

Trove categories: [change]

[Development Status]		5 - Production/Stable
[License]		OSI Approved :: zlib/libpng License
[Operating System]		OS Independent
[Programming Language]		C
[Topic]		Software Development :: Libraries, System :: Archiving :: Compression

Dependencies: [change]
No dependencies filed

 Branches

Branch	Version	Last release	License	URLs
Default	1.2.3	14-Oct-2005	zlib/libpng License

 Releases

Version	Focus	Date
1.2.3	Major security fixes	14-Oct-2005 08:28
1.2.2	Major security fixes	11-Jul-2005 23:37
1.2.1	Major feature enhancements	02-Dec-2003 15:40
1.1.4	Major security fixes	12-Mar-2002 00:12
1.1.3	N/A	21-Feb-2001 10:13

 Articles referencing this project

Red Hat: Updated zlib packages fix a buffer overflow by Patrick Lenz , in Security Thu, Jul 21st 2005 12:27 Debian: New zlib packages fix buffer overflow by Patrick Lenz , in Security Wed, Jul 20th 2005 23:07 SuSE: New zlib packages fix remote denial of service by Patrick Lenz , in Security Wed, Jul 6th 2005 08:31 Red Hat: Updated Zlib packages fix a buffer overflow by Patrick Lenz , in Security Wed, Jul 6th 2005 08:23 Debian: New zlib packages fix denial of service by Patrick Lenz , in Security Wed, Jul 6th 2005 08:21

SuSE: New zlib packages fix denial of service by Patrick Lenz , in Security Thu, Sep 2nd 2004 22:53 Red Hat: Updated zlib packages fix gzprintf buffer overflow vulnerability by Patrick Lenz , in Security Tue, Apr 29th 2003 02:51 PalmOS Software by David Wheeler , in Category Reviews Wed, May 1st 2002 00:00 Debian: New zlib & other packages fix buffer overflow by Patrick Lenz , in Security Wed, Mar 13th 2002 02:27 [more articles]