CUPS 2.4.4 release is created as a hotfix for segfault in cupsGetNamedDest(), when caller tries to find the default destination and the default destination is not set on the machine.

I'm sorry for inconvenience and enjoy the hotfix!

CUPS 2.4.3 brings fix for CVE-2023-32324, several improvements and many bug fixes. CUPS now implements fallback for printers with broken firmware, which is not capable of answering to IPP request get-printer-attributes with all, media-col-database - this enables driverless support for bunch of printers which don't follow IPP Everywhere standard. Aside from the CVE fix the most important fixes are around color settings, printer application support fixes and OpenSSL support.

Detailed list of changes:

• Added a title with device uri for found network printers (Issues #402, #393)
• Added new media sizes defined by IANA (Issues #501)
• Added quirk for GoDEX label printers (Issue #440)
• Fixed --enable-libtool-unsupported (Issue #394)
• Fixed configuration on RISC-V machines (Issue #404)
• Fixed the device_uri invalid pointer for driverless printers with .local
  hostname (Issue #419)
• Fixed an OpenSSL crash bug (Issue #409)
• Fixed a potential SNMP OID value overflow issue (Issue #431)
• Fixed an OpenSSL certificate loading issue (Issue #465)
• Fixed Brazilian Portuguese translations (Issue #288)
• Fixed cupsd default keychain location when building with OpenSSL
  (Issue #529)
• Fixed default color settings for CMYK printers as well (Issue #500)
• Fixed duplicate PPD2IPP media-type names (Issue #688)
• Fixed possible heap buffer overflow in _cups_strlcpy() (fixes CVE-2023-32324)
• Fixed InputSlot heuristic for photo sizes smaller than 5x7" if there is no
  media-source in the request (Issue #569)
• Fixed invalid memory access during generating IPP Everywhere queue
  (Issue #466)
• Fixed lprm if no destination is provided (Issue #457)
• Fixed memory leaks in create_local_bg_thread() (Issue #466)
• Fixed media size tolerance in ippeveprinter (Issue #487)
• Fixed passing command name without path into ippeveprinter (Issue #629)
• Fixed saving strings file path in printers.conf (Issue #710)
• Fixed TLS certificate generation bugs (Issue #652)
• ippDeleteValues would not delete the last value (Issue #556)
• Ignore some of IPP defaults if the application sends its PPD alternative
  (Issue #484)
• Make Letter the default size in ippevepcl (Issue #543)
• Now accessing Admin page in Web UI requires authentication (Issue #518)
• Now look for default printer on network if needed (Issue #452)
• Now we poll media-col-database separately if we fail at first (Issue #599)
• Now report fax attributes and values as needed (Issue #459)
• Now localize HTTP responses using the Content-Language value (Issue #426)
• Raised file size limit for importing PPD via Web UI (Issue #433)
• Raised maximum listen backlog size to INT MAX (Issue #626)
• Update print-color-mode if the printer is modified via ColorModel PPD option
  (Issue #451)
• Use localhost when printing via printer application (Issue #353)
• Write defaults into /etc/cups/lpoptions if we're root (Issue #456)

Enjoy! :)

CUPS 2.4.2 brings the fix for CVE-2022-26691, together with LibreSSL/OpenSSL and minimal AIX support. There are lots of bug fixes as well, feel free to check the list of changes:

• Fixed certificate strings comparison for Local authorization (CVE-2022-26691)
• The cupsFileOpen function no longer opens files for append in read-write
  mode (Issue #291)
• The cupsd daemon removed processing temporary queue (Issue #364)
• Fixed delay in IPP backend if GNUTLS is used and endpoint doesn't confirm
  closing the connection (Issue #365)
• Fixed conditional jump based on uninitialized value in cups/ppd.c (Issue #329)
• Fixed CSS related issues in CUPS Web UI (Issue #344)
• Fixed copyright in CUPS Web UI trailer template (Issue #346)
• mDNS hostname in device uri is not resolved when installaling a permanent
  IPP Everywhere queue (Issues #340, #343)
• The lpstat command now reports when the scheduler is not running
  (Issue #352)
• Updated the man pages concerning the -h option (Issue #357)
• Re-added LibreSSL/OpenSSL support (Issue #362)
• Updated the Solaris smf service file (Issue #368)
• Fixed a regression in lpoptions option support (Issue #370)
• The scheduler now regenerates the PPD cache information after changing the
  "cupsd.conf" file (Issue #371)
• Updated the scheduler to set "auth-info-required" to "username,password" if a
  backend reports it needs authentication info but doesn't set a method for
  authentication (Issue #373)
• Updated the configure script to look for the OpenSSL library the old way if
  pkg-config is not available (Issue #375)
• Fixed the prototype for the httpWriteResponse function (Issue #380)
• Brought back minimal AIX support (Issue #389)
• cupsGetResponse did not always set the last error.
• Fixed a number of old references to the Apple CUPS web page.
• Restored the default/generic printer icon file for the web interface.
• Removed old stylesheet classes that are no longer used by the web
  interface.

Enjoy the new CUPS release!

CUPS 2.4.1 is the first bug fix release from 2.4.x series. Among the other bug fixes it fixes sharing default color mode to clients and several memory leaks.

Detailed list of changes:

• The default color mode now is now configurable and defaults to the printer's
  reported default mode (Issue #277)
• Configuration script now checks linking for -Wl,-pie flags (Issue #303)
• Fixed memory leaks - in testi18n (Issue #313), in cups_enum_dests()
  (Issue #317), in _cupsEncodeOption() and http_tls_upgrade() (Issue #322)
• Fixed missing bracket in de/index.html (Issue #299)
• Fixed typos in configuration scripts (Issues #304, #316)
• Removed remaining legacy code for RIP_MAX_CACHE environment variable
  (Issue #323)
• Removed deprecated directives from cupsctl and cups-files.conf (Issue #300)
• Removed purge-jobs legacy code from CGI scripts and templates (Issue #325)

Enjoy! :)

CUPS 2.4.0 is the latest stable OpenPrinting CUPS release. Among the changes from beta and release candidate the stable release adds two new configuration options for optimizing cupsd setup on servers and several other changes.

The detailed list of changes:

• Added configure option --with-idle-exit-timeout (Issue #294)$
• Added --with-systemd-timeoutstartsec configure option (Issue #298)$
• DigestOptions now are applied for MD5 Digest authentication defined$
  by RFC 2069 as well (Issue #287)$
• Fixed compilation on Solaris (Issue #293)$
• Fixed and improved German translations (Issue #296, Issue #297)

Enjoy! :)

CUPS 2.4rc1 is a release candidate for OpenPrinting CUPS 2.4.0, which adds two enhancements before the stable release.

The detailed list of changes:

• Added warning and debug messages when loading printers
  if the queue is raw or with driver (Issue #286)
• Compilation now uses -fstack-protector-strong if available (Issue #285)

Enjoy!

CUPS 2.4b1 is the beta release for OpenPrinting CUPS 2.4 which contains several new features such as basic OAuth support, support for AirPrint and Mopria clients and support for running CUPS as a snap, several deprecations (Kerberos, cups-config), removals of old deprecated directives, and many bug fixes.

The detailed list of changes:

• Added support for CUPS running in a Snapcraft snap.
• Added basic OAuth 2.0 client support (Issue #100)
• Added support for AirPrint and Mopria clients (Issue #105)
• Added configure support for specifying systemd dependencies in the CUPS
  service file (Issue #144)
• Added several features and improvements to ipptool (Issue #153)
• Added a JSON output mode for ipptool.
• The ipptool command now correctly reports an error when a test file cannot
  be found.
• CUPS library now uses thread safe getpwnam_r and getpwuid_r functions (Issue #274)
• Fixed Kerberos authentication for the web interface (Issue #19)
• The ZPL sample driver now supports more "standard" label sizes (Issue #70)
• Fixed reporting of printer instances when enumerating and when no options are
  set for the main instance (Issue #71)
• Reverted USB read limit enforcement change from CUPS 2.2.12 (Issue #72)
• The IPP backend did not return the correct status code when a job was canceled
  at the printer/server (Issue #74)
• The testlang unit test program now loops over all of the available locales
  by default (Issue #85)
• The cupsfilter command now shows error messages when options are used
  incorrectly (Issue #88)
• The PPD functions now treat boolean values as case-insensitive (Issue #106)
• Temporary queue names no longer end with an underscore (Issue #110)
• The USB backend now runs as root (Issue #121)
• Added pkg-config file for libcups (Issue #122)
• Fixed a PPD memory leak caused by emulator definitions (Issue #124)
• Fixed a DISPLAY bug in ipptool (Issue #139)
• The scheduler now includes the [Job N] prefix for job log messages, even
  when using syslog logging (Issue #154)
• Added support for locales using the GB18030 character set (Issue #159)
• httpReconnect2 did not reset the socket file descriptor when the TLS
  negotiation failed (Apple #5907)
• httpUpdate did not reset the socket file descriptor when the TLS
  negotiation failed (Apple #5915)
• The IPP backend now retries Validate-Job requests (Issue #132)
• Now show better error messages when a driver interface program fails to
  provide a PPD file (Issue #148)
• Added dark mode support to the CUPS web interface (Issue #152)
• Added a workaround for Solaris in httpAddrConnect2 (Issue #156)
• Fixed an interaction between --remote-admin and --remote-any for the
  cupsctl command (Issue #158)
• Now use a 60 second timeout for reading USB backchannel data (Issue #160)
• The USB backend now tries harder to find a serial number (Issue #170)
• Fixed @IF(name) handling in cupsd.conf (Apple #5918)
• Fixed documentation and added examples for CUPS' limited CGI support
  (Apple #5940)
• Fixed the lpc command prompt (Apple #5946)
• Now always pass "localhost" in the Host: header when talking over a domain
  socket or the loopback interface (Issue #185)
• Fixed a job history update issue in the scheduler (Issue #187)
• Fixed job-pages-per-set value for duplex print jobs.
• Fixed an edge case in ippReadIO to make sure that only complete attributes
  and values are retained on an error (Issue #195)
• Hardened ippReadIO to prevent invalid IPP messages from being propagated
  (Issue #195, Issue #196)
• The scheduler now supports the "everywhere" model directly (Issue #201)
• Fixed some IPP Everywhere option mapping problems (Issue #238)
• Fixed support for "job-hold-until" with the Restart-Job operation (Issue #250)
• Fixed the default color/grayscale presets for IPP Everywhere PPDs (Issue #262)
• Fixed support for the 'offline-report' state for all USB backends (Issue #264)
• Documentation fixes (Issue #92, Issue #163, Issue #177, Issue #184)
• Localization updates (Issue #123, Issue #129, Issue #134, Issue #146,
  Issue #164)
• USB quirk updates (Issue #192, Issue #270, Apple #5766, Apple #5838,
  Apple #5843, Apple #5867)
• Web interface updates (Issue #142, Issue #218)
• The ippeveprinter tool now automatically uses an available port.
• Fixed several Windows TLS and hashing issues.
• Deprecated cups-config (Issue #97)
• Deprecated Kerberos (AuthType Negotiate) authentication (Issue #98)
• Removed support for the (long deprecated and unused) FontPath,
  ListenBackLog, LPDConfigFile, KeepAliveTimeout, RIPCache, and
  SMBConfigFile directives in cupsd.conf and cups-files.conf.
• Stubbed out deprecated httpMD5 functions.
• Add test for undefined page ranges during printing.

Enjoy!

CUPS 2.3.3op2 is the latest OpenPrinting CUPS security and bug fix
release. Changes include:

• Security: Fixed a buffer (read) overflow in the ippReadIO function
  (CVE-2020-10001)
• Clarified the documentation for the "Listen" directive (Issue #53)
• Fixed duplicate ColorModel entries for AirPrint printers (Issue 59)
• Fixed directory/permission defaults for Debian kfreebsd-based systems
  (Issue #60, Issue #61)
• Fixed crash bug in ppdOpen (Issue #64, Issue #78)
• Fixed regression in snprintf emulation function (Issue #67)
• The scheduler's systemd service file now waits for the nslcd service to start
  (Issue #69)
• The libusb-based USB backend now uses a simpler read timer implementation to
  avoid a regression in a previous change (Issue #72)
• The PPD caching code now only tracks the APPrinterIconPath value on macOS
  (Issue #73)
• Fixed segfault in help.cgi when searching in man pages (Issue #81)
• Root certificates were incorrectly stored in "~/.cups/ssl".

Enjoy!

CUPS 2.3.3op1 is the first OpenPrinting CUPS release which fixes many bugs,
incorporates common Linux distribution changes, and provides several IPP
Everywhere improvements. Changes include:

• The automated test suite can now be activated using make test for
  consistency with other projects and CI environments - the old make check
  continues to work as well, and the previous test server behavior can be
  accessed by running make testserver.
• ippeveprinter now supports multiple icons and strings files.
• ippeveprinter now uses the system's FQDN with Avahi.
• ippeveprinter now supports Get-Printer-Attributes on "/".
• ippeveprinter now uses a deterministic "printer-uuid" value.
• ippeveprinter now uses system sounds on macOS for Identify-Printer.
• Updated ippfind to look for files in "~/Desktop" on Windows.
• Updated ippfind to honor SKIP-XXX directives with PAUSE.
• Updated IPP Everywhere support to work around printers that only advertise
  color raster support but really also support grayscale (Issue #1)
• ipptool now supports DNS-SD URIs like ipps://My%20Printer._ipps._tcp.local
  (Issue #5)
• The scheduler now allows root backends to have world read permissions but not
  world execute permissions (Issue #21)
• Failures to bind IPv6 listener sockets no longer cause errors if IPv6 is
  disabled on the host (Issue #25)
• The SNMP backend now supports the HP and Ricoh vendor MIBs (Issue #28)
• The scheduler no longer includes a timestamp in files it writes (Issue #29)
• The systemd service names are now "cups.service" and "cups-lpd.service"
  (Issue #30, Issue #31)
• The scheduler no longer adds the local hostname to the ServerAlias list
  (Issue #32)
• Added LogFileGroup directive in "cups-files.conf" to control the group
  owner of log files (Issue #34)
• Added --with-max-log-size configure option (Issue #35)
• Added --enable-sync-on-close configure option (Issue #37)
• Added --with-error-policy configure option (Issue #38)
• IPP Everywhere PPDs could have an "unknown" default InputSlot (Issue #44)
• The httpAddrListen function now uses a listen backlog of 128.
• Added USB quirks (Apple issue #5789, #5823, #5831)
• Fixed IPP Everywhere v1.1 conformance issues in ippeveprinter.
• Fixed DNS-SD name collision support in ippeveprinter.
• Fixed compiler and code analyzer warnings.
• Fixed TLS support on Windows.
• Fixed ippfind sub-type searches with Avahi.
• Fixed the default hostname used by ippeveprinter on macOS.
• Fixed resolution of local IPP-USB printers with Avahi.
• Fixed coverity issues (Issue #2)
• Fixed httpAddrConnect issues (Issue #3)
• Fixed web interface device URI issue (Issue #4)
• Fixed lp/lpr "printer/class not found" error reporting (Issue #6)
• Fixed xinetd support for LPD clients (Issue #7)
• Fixed libtool build issue (Issue #11)
• Fixed a memory leak in the scheduler (Issue #12)
• Fixed a potential integer overflow in the PPD hashing code (Issue #13)
• Fixed output-bin and print-quality handling issues (Issue #18)
• Fixed PPD options getting mapped to odd IPP values like "tray---4" (Issue #23)
• Fixed remote access to the cupsd.conf and log files (Issue #24)
• Fixed the automated test suite when running in certain build/CI environments
  (Issue #25)
• Fixed a logging regression caused by a previous change for Apple issue #5604
  (Issue #25)
• Fixed fax phone number handling with GNOME (Issue #40)
• Fixed potential rounding error in rastertopwg filter (Issue #41)
• Fixed the "uri-security-supported" value from the scheduler (Issue #42)
• Fixed IPP backend crash bug with "printer-alert" values (Issue #43)
• Removed old Solaris inetconv(1m) reference in cups-lpd man page (Issue #46)
• Fixed default options that incorrectly use the "custom" prefix (Issue #48)
• Fixed a memory leak when resolving DNS-SD URIs (Issue #49)
• Fixed systemd status reporting by adopting the notify interface (Issue #51)
• Fixed crash in rastertopwg (Apple issue #5773)
• Fixed cupsManualCopies values in IPP Everywhere PPDs (Apple issue #5807)

Enjoy!