NOTE: We are looking for help with a few things:
      https://github.com/libexpat/libexpat/labels/help%20wanted
      If you can help, please get in touch.  Thanks!

Release 2.2.1 Sat June 17 2017
        Security fixes:
                  CVE-2017-9233 -- External entity infinite loop DoS
                    Details: https://libexpat.github.io/doc/cve-2017-9233/
                    Commit c4bf96bb51dd2a1b0e185374362ee136fe2c9d7f
   [MOX-002]      CVE-2016-9063 -- Detect integer overflow; commit
                    d4f735b88d9932bd5039df2335eefdd0723dbe20
                    (Fixed version of existing downstream patches!)
   (SF.net) #539  Fix regression from fix to CVE-2016-0718 cutting off
                    longer tag names; commits
                    * 896b6c1fd3b842f377d1b62135dccf0a579cf65d
                    * af507cef2c93cb8d40062a0abe43a4f4e9158fb2
             #16    * 0dbbf43fdb20f593ddf4fa1ff67288000dd4a7fd
             #25  More integer overflow detection (function poolGrow); commits
                    * 810b74e4703dcfdd8f404e3cb177d44684775143
                    * 44178553f3539ce69d34abee77a05e879a7982ac
   [MOX-002]      Detect overflow from len=INT_MAX call to XML_Parse; commits
                    * 4be2cb5afcc018d996f34bbbce6374b7befad47f
                    * 7e5b71b748491b6e459e5c9a1d090820f94544d8
   [MOX-005] #30  Use high quality entropy for hash initialization:
                    * arc4random_buf on BSD, systems with libbsd
                      (when configured with --with-libbsd), CloudABI
                    * RtlGenRandom on Windows XP / Server 2003 and later
                    * getrandom on Linux 3.17+
                    In a way, that's still part of CVE-2016-5300.
                    https://github.com/libexpat/libexpat/pull/30/commits
   [MOX-005]      For the low quality entropy extraction fallback code,
                    the parser instance address can no longer leak, commit
                    04ad658bd3079dd15cb60fc67087900f0ff4b083
   [MOX-003]      Prevent use of uninitialised variable; commit
   [MOX-004]        a4dc944f37b664a3ca7199c624a98ee37babdb4b
                  Add missing parameter validation to public API functions
                    and dedicated error code XML_ERROR_INVALID_ARGUMENT:
   [MOX-006]        * NULL checks; commits
                      * d37f74b2b7149a3a95a680c4c4cd2a451a51d60a (merge/many)
                      * 9ed727064b675b7180c98cb3d4f75efba6966681
                      * 6a747c837c50114dfa413994e07c0ba477be4534
                    * Negative length (XML_Parse); commit
   [MOX-002]          70db8d2538a10f4c022655d6895e4c3e78692e7f
   [MOX-001] #35  Change hash algorithm to William Ahern's version of SipHash
                    to go further with fixing CVE-2012-0876.
                    https://github.com/libexpat/libexpat/pull/39/commits

        Bug fixes:
             #32  Fix sharing of hash salt across parsers;
                    relevant where XML_ExternalEntityParserCreate is called
                    prior to XML_Parse, in particular (e.g. FBReader)
             #28  xmlwf: Auto-disable use of memory-mapping (and parsing
                    as a single chunk) for files larger than ~1 GB (2^30 bytes)
                    rather than failing with error "out of memory"
              #3  Fix double free after malloc failure in DTD code; commit
                    7ae9c3d3af433cd4defe95234eae7dc8ed15637f
             #17  Fix memory leak on parser error for unbound XML attribute
                    prefix with new namespaces defined in the same tag;
                    found by Google's OSS-Fuzz; commits
                    * 16f87daae5a16132e479e4f71862128c7a915c73
                    * b47dbc9745932c160893d433220e462bd605f8cd
                  xmlwf on Windows: Add missing calls to CloseHandle

        New features:
             #30  Introduced environment switch EXPAT_ENTROPY_DEBUG=1
                    for runtime debugging of entropy extraction

        Other changes:
                  Increase code coverage
             #33  Reject use of XML_UNICODE_WCHAR_T with sizeof(wchar_t) != 2;
                    XML_UNICODE_WCHAR_T was never meant to be used outside
                    of Windows; 4-byte wchar_t is common on Linux
   (SF.net) #538  Start using -fno-strict-aliasing
   (SF.net) #540  Support compilation against cloudlibc of CloudABI
                  Allow MinGW cross-compilation
   (SF.net) #534  CMake: Introduce option "BUILD_doc" (enabled by default)
                    to bypass compilation of the xmlwf.1 man page
   (SF.net)  pr2  CMake: Introduce option "INSTALL" (enabled by default)
                    to bypass installation of expat files
                  CMake: Fix ninja support
                  Autotools: Add parameters --enable-xml-context [COUNT]
                    and --disable-xml-context; default of context of 1024
                    bytes enabled unchanged
             #14  Drop AmigaOS 4.x code and includes
             #14  Drop ancient build systems:
                    * Borland C++ Builder
                    * OpenVMS
                    * Open Watcom
                    * Visual Studio 6.0
                    * Pre-X Mac OS (MPW Makefile)
                    If you happen to rely on some of these, please get in
                    touch for joining with maintenance.
             #10  Move from WIN32 to _WIN32
             #13  Fix "make run-xmltest" order instability
                  Address compile warnings
                  Bump version info from 7:2:6 to 7:3:6
                  Add AUTHORS file

        Infrastructure:
              #1  Migrate from SourceForge to GitHub (except downloads):
                    https://github.com/libexpat/
              #1  Re-create http://libexpat.org/ project website
                  Start utilizing Travis CI

        Special thanks to:
            Andy Wang
            Don Lewis
            Ed Schouten
            Karl Waclawek
            Pascal Cuoq
            Rhodri James
            Sergei Nikulov
            Tobias Taschner
            Viktor Szakats
                 and
            Core Infrastructure Initiative
            Mozilla Foundation (MOSS Track 3: Secure Open Source)
            Radically Open Security

Release 2.2.0 Tue June 21 2016
        Security fixes:
            #537  CVE-2016-0718 -- Fix crash on malformed input
                  CVE-2016-4472 -- Improve insufficient fix to CVE-2015-1283 /
                                   CVE-2015-2716 introduced with Expat 2.1.1
            #499  CVE-2016-5300 -- Use more entropy for hash initialization
                                   than the original fix to CVE-2012-0876
            #519  CVE-2012-6702 -- Resolve troublesome internal call to srand
                                   that was introduced with Expat 2.1.0
                                   when addressing CVE-2012-0876 (issue #496)

        Bug fixes:
                  Fix uninitialized reads of size 1
                    (e.g. in little2_updatePosition)
                  Fix detection of UTF-8 character boundaries

        Other changes:
            #532  Fix compilation for Visual Studio 2010 (keyword "C99")
                  Autotools: Resolve use of "$<" to better support bmake
                  Autotools: Add QA script "qa.sh" (and make target "qa")
                  Autotools: Respect CXXFLAGS if given
                  Autotools: Fix "make run-xmltest"
                  Autotools: Have "make run-xmltest" check for expected output
             p90  CMake: Fix static build (BUILD_shared=OFF) on Windows
            #536  CMake: Add soversion, support -DNO_SONAME=yes to bypass
            #323  CMake: Add suffix "d" to differentiate debug from release
                  CMake: Define WIN32 with CMake on Windows
                  Annotate memory allocators for GCC
                  Address all currently known compile warnings
                  Make sure that API symbols remain visible despite
                    -fvisibility=hidden
                  Remove executable flag from source files
                  Resolve COMPILED_FROM_DSP in favor of WIN32

        Special thanks to:
            Björn Lindahl
            Christian Heimes
            Cristian Rodríguez
            Daniel Krügler
            Gustavo Grieco
            Karl Waclawek
            László Böszörményi
            Marco Grassi
            Pascal Cuoq
            Sergei Nikulov
            Thomas Beutlich
            Warren Young
            Yann Droneaud

Release 2.1.1 Sat March 12 2016
        Security fixes:
            #582: CVE-2015-1283 - Multiple integer overflows in XML_GetBuffer

        Bug fixes:
            #502: Fix potential null pointer dereference
            #520: Symbol XML_SetHashSalt was not exported
            Output of "xmlwf -h" was incomplete

        Other changes:
            #503: Document behavior of calling XML_SetHashSalt with salt 0
            Minor improvements to man page xmlwf(1)
            Improvements to the experimental CMake build system
            libtool now invoked with --verbose

Release 2.1.0 Sat March 24 2012
        - Security fixes:
          #2958794: CVE-2012-1148 - Memory leak in poolGrow.
          #2895533: CVE-2012-1147 - Resource leak in readfilemap.c.
          #3496608: CVE-2012-0876 - Hash DOS attack.
          #2894085: CVE-2009-3560 - Buffer over-read and crash in big2_toUtf8().
          #1990430: CVE-2009-3720 - Parser crash with special UTF-8 sequences.
        - Bug Fixes:
          #1742315: Harmful XML_ParserCreateNS suggestion.
          #1785430: Expat build fails on linux-amd64 with gcc version>=4.1 -O3.
          #1983953, 2517952, 2517962, 2649838: 
                Build modifications using autoreconf instead of buildconf.sh.
          #2815947, #2884086: OBJEXT and EXEEXT support while building.
          #2517938: xmlwf should return non-zero exit status if not well-formed.
          #2517946: Wrong statement about XMLDecl in xmlwf.1 and xmlwf.sgml.
          #2855609: Dangling positionPtr after error.
          #2990652: CMake support.
          #3010819: UNEXPECTED_STATE with a trailing "%" in entity value.
          #3206497: Unitialized memory returned from XML_Parse.
          #3287849: make check fails on mingw-w64.
        - Patches:
          #1749198: pkg-config support.
          #3010222: Fix for bug #3010819.
          #3312568: CMake support.
          #3446384: Report byte offsets for attr names and values.
        - New Features / API changes:
          Added new API member XML_SetHashSalt() that allows setting an initial
                value (salt) for hash calculations. This is part of the fix for
                bug #3496608 to randomize hash parameters.
          When compiled with XML_ATTR_INFO defined, adds new API member
                XML_GetAttributeInfo() that allows retrieving the byte
                offsets for attribute names and values (patch #3446384).
          Added CMake build system.
                See bug #2990652 and patch #3312568.
          Added run-benchmark target to Makefile.in - relies on testdata module
                present in the same relative location as in the repository.
          
Release 2.0.1 Tue June 5 2007
        - Fixed bugs #1515266, #1515600: The character data handler's calling
          of XML_StopParser() was not handled properly; if the parser was
          stopped and the handler set to NULL, the parser would segfault.
        - Fixed bug #1690883: Expat failed on EBCDIC systems as it assumed
          some character constants to be ASCII encoded.
        - Minor cleanups of the test harness.
        - Fixed xmlwf bug #1513566: "out of memory" error on file size zero.
        - Fixed outline.c bug #1543233: missing a final XML_ParserFree() call.
        - Fixes and improvements for Windows platform:
          bugs #1409451, #1476160, #1548182, #1602769, #1717322.
        - Build fixes for various platforms:
          HP-UX, Tru64, Solaris 9: patch #1437840, bug #1196180.
          All Unix: #1554618 (refreshed config.sub/config.guess).
                    #1490371, #1613457: support both, DESTDIR and INSTALL_ROOT,
                    without relying on GNU-Make specific features.
          #1647805: Patched configure.in to work better with Intel compiler.
        - Fixes to Makefile.in to have make check work correctly:
          bugs #1408143, #1535603, #1536684.
        - Added Open Watcom support: patch #1523242.

Release 2.0.0 Wed Jan 11 2006
        - We no longer use the "check" library for C unit testing; we
          always use the (partial) internal implementation of the API.
        - Report XML_NS setting via XML_GetFeatureList().
        - Fixed headers for use from C++.
        - XML_GetCurrentLineNumber() and  XML_GetCurrentColumnNumber()
          now return unsigned integers.
        - Added XML_LARGE_SIZE switch to enable 64-bit integers for
          byte indexes and line/column numbers.
        - Updated to use libtool 1.5.22 (the most recent).
        - Added support for AmigaOS.
        - Some mostly minor bug fixes. SF issues include: #1006708,
          #1021776, #1023646, #1114960, #1156398, #1221160, #1271642.

Release 1.95.8 Fri Jul 23 2004
        - Major new feature: suspend/resume.  Handlers can now request
          that a parse be suspended for later resumption or aborted
          altogether.  See "Temporarily Stopping Parsing" in the
          documentation for more details.
        - Some mostly minor bug fixes, but compilation should no
          longer generate warnings on most platforms.  SF issues
          include: #827319, #840173, #846309, #888329, #896188, #923913,
          #928113, #961698, #985192.

Release 1.95.7 Mon Oct 20 2003
        - Fixed enum XML_Status issue (reported on SourceForge many
          times), so compilers that are properly picky will be happy.
        - Introduced an XMLCALL macro to control the calling
          convention used by the Expat API; this macro should be used
          to annotate prototypes and definitions of callback
          implementations in code compiled with a calling convention
          other than the default convention for the host platform.
        - Improved ability to build without the configure-generated
          expat_config.h header.  This is useful for applications
          which embed Expat rather than linking in the library.
        - Fixed a variety of bugs: see SF issues #458907, #609603,
          #676844, #679754, #692878, #692964, #695401, #699323, #699487,
          #820946.
        - Improved hash table lookups.
        - Added more regression tests and improved documentation.

Release 1.95.6 Tue Jan 28 2003
        - Added XML_FreeContentModel().
        - Added XML_MemMalloc(), XML_MemRealloc(), XML_MemFree().
        - Fixed a variety of bugs: see SF issues #615606, #616863,
          #618199, #653180, #673791.
        - Enhanced the regression test suite.
        - Man page improvements: includes SF issue #632146.

Release 1.95.5 Fri Sep 6 2002
        - Added XML_UseForeignDTD() for improved SAX2 support.
        - Added XML_GetFeatureList().
        - Defined XML_Bool type and the values XML_TRUE and XML_FALSE.
        - Use an incomplete struct instead of a void* for the parser
          (may not retain).
        - Fixed UTF-8 decoding bug that caused legal UTF-8 to be rejected.
        - Finally fixed bug where default handler would report DTD
          events that were already handled by another handler.
          Initial patch contributed by Darryl Miles.
        - Removed unnecessary DllMain() function that caused static
          linking into a DLL to be difficult.
        - Added VC++ projects for building static libraries.
        - Reduced line-length for all source code and headers to be
          no longer than 80 characters, to help with AS/400 support.
        - Reduced memory copying during parsing (SF patch #600964).
        - Fixed a variety of bugs: see SF issues #580793, #434664,
          #483514, #580503, #581069, #584041, #584183, #584832, #585537,
          #596555, #596678, #598352, #598944, #599715, #600479, #600971.

Release 1.95.4 Fri Jul 12 2002
        - Added support for VMS, contributed by Craig Berry.  See
          vms/README.vms for more information.
        - Added Mac OS (classic) support, with a makefile for MPW,
          contributed by Thomas Wegner and Daryle Walker.
        - Added Borland C++ Builder 5 / BCC 5.5 support, contributed
          by Patrick McConnell (SF patch #538032).
        - Fixed a variety of bugs: see SF issues #441449, #563184,
          #564342, #566334, #566901, #569461, #570263, #575168, #579196.
        - Made skippedEntityHandler conform to SAX2 (see source comment)
        - Re-implemented WFC: Entity Declared from XML 1.0 spec and
          added a new error "entity declared in parameter entity":
          see SF bug report #569461 and SF patch #578161
        - Re-implemented section 5.1 from XML 1.0 spec:
          see SF bug report #570263 and SF patch #578161

Release 1.95.3 Mon Jun 3 2002
        - Added a project to the MSVC workspace to create a wchar_t
          version of the library; the DLLs are named libexpatw.dll.
        - Changed the name of the Windows DLLs from expat.dll to
          libexpat.dll; this fixes SF bug #432456.
        - Added the XML_ParserReset() API function.
        - Fixed XML_SetReturnNSTriplet() to work for element names.
        - Made the XML_UNICODE builds usable (thanks, Karl!).
        - Allow xmlwf to read from standard input.
        - Install a man page for xmlwf on Unix systems.
        - Fixed many bugs; see SF bug reports #231864, #461380, #464837,
          #466885, #469226, #477667, #484419, #487840, #494749, #496505,
          #547350.  Other bugs which we can't test as easily may also
          have been fixed, especially in the area of build support.

Release 1.95.2 Fri Jul 27 2001
        - More changes to make MSVC happy with the build; add a single
          workspace to support both the library and xmlwf application.
        - Added a Windows installer for Windows users; includes
          xmlwf.exe.
        - Added compile-time constants that can be used to determine the
          Expat version
        - Removed a lot of GNU-specific dependencies to aide portability
          among the various Unix flavors.
        - Fix the UTF-8 BOM bug.
        - Cleaned up warning messages for several compilers.
        - Added the -Wall, -Wstrict-prototypes options for GCC.

Release 1.95.1 Sun Oct 22 15:11:36 EDT 2000
        - Changes to get expat to build under Microsoft compiler
        - Removed all aborts and instead return an UNEXPECTED_STATE error.
        - Fixed a bug where a stray '%' in an entity value would cause an
          abort.
        - Defined XML_SetEndNamespaceDeclHandler. Thanks to Darryl Miles for
          finding this oversight.
        - Changed default patterns in lib/Makefile.in to fit non-GNU makes
          Thanks to robin@unrated.net for reporting and providing an
          account to test on.
        - The reference had the wrong label for XML_SetStartNamespaceDecl.
          Reported by an anonymous user.

Release 1.95.0 Fri Sep 29 2000
        - XML_ParserCreate_MM
                Allows you to set a memory management suite to replace the
                standard malloc,realloc, and free.
        - XML_SetReturnNSTriplet
                If you turn this feature on when namespace processing is in
                effect, then qualified, prefixed element and attribute names
                are returned as "uri|name|prefix" where '|' is whatever
                separator character is used in namespace processing.
        - Merged in features from perl-expat
                o XML_SetElementDeclHandler
                o XML_SetAttlistDeclHandler
                o XML_SetXmlDeclHandler
                o XML_SetEntityDeclHandler
                o StartDoctypeDeclHandler takes 3 additional parameters:
                        sysid, pubid, has_internal_subset
                o Many paired handler setters (like XML_SetElementHandler)
                  now have corresponding individual handler setters
                o XML_GetInputContext for getting the input context of
                  the current parse position.
        - Added reference material
        - Packaged into a distribution that builds a sharable library