Symfony 4.4.26 has just been released. Here is a list of the most
important changes:

bug #41893 [Filesystem] Workaround cannot dumpFile into “protected” folders on Windows (@arnegroskurth)
bug #41665 [HttpKernel] Keep max lifetime also when part of the responses don’t set it (@mpdude)
bug #41760 [ErrorHandler] fix handling buffered SilencedErrorContext (@nicolas-grekas)
bug #41807 [HttpClient] fix Psr18Client when allo _ur _fopen=0 (@nicolas-grekas)
bug #40857 [DependencyInjection] Add support of PHP enumerations (@alexandre-daubois)
bug #41767 [Config] fix tracking default values that reference the parent class (@nicolas-grekas)
bug #41768 [DependencyInjection] Fix binding “iterable $foo” when using the PHP-DSL (@nicolas-grekas)
bug #41793 [Cache] handle prefixed redis connections when clearing pools (@nicolas-grekas)
bug #41804 [Cache] fix eventual consistency when using RedisTagAwareAdapter with a cluster (@nicolas-grekas)
bug #41773 [Cache] Disable locking on Windows by default (@nicolas-grekas)
bug #41655 [Mailer] fix encoding of addresses using SmtpTransport (@dmaicher)
bug #41663 [HttpKernel] [HttpCache] Keep s-maxage=0 from ESI sub-responses (@mpdude)
bug #41701 [VarDumper] Fix tests for PHP 8.1 (@alexandre-daubois)
bug #41795 [FrameworkBundle] Replace va _export with VarExporter to use array short syntax in secrets list files (@alexandre-daubois)
bug #41779 [DependencyInjection] throw proper exception when decorating a synthetic service (@nicolas-grekas)
bug #41776 [ErrorHandler] [DebugClassLoader] Do not check Phake mocks classes (@adoy)
bug #41780 [PhpUnitBridge] fix handling the COMPOSE _BINARY env var when using simple-phpunit (@Taluu)
bug #41670 [HttpFoundation] allow savePath of NativeFileSessionHandler to be null (@simon.chrzanowski)
bug #41644 [Config] fix tracking attributes in ReflectionClassResource (@nicolas-grekas)
bug #41621 [Process] Fix incorrect parameter type (@bch36)
bug #41624 [HttpClient] Revert bindto workaround for unaffected PHP versions (@derrabus)
bug #41549 [Security] Fix opcache preload with alias classes (@jderusse)
bug #41491 [Serializer] Do not allow to denormalize string with spaces only to valid a DateTime object (@sidz)
bug #41386 [Console] Escape synopsis output (@jschaedl)
bug #41495 [HttpFoundation] Add ReturnTypeWillChange to SessionHandlers (@nikic)

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backwards-compatibility very closely, this should be quite easy. Use
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to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

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