Symfony 4.4.38 has just been released.
Here is the list of the most important changes since 4.4.37:

bug #44570 [WebProfilerBundle] add nonces to profiler (@garak)
bug #44839 MailerInterface: failed exception contract when enabling messenger (@Giorgio Premi)
bug #45529 [DependencyInjection] Don’t reset env placeholders during compilation (@nicolas-grekas)
bug #45527 [HttpClient] Fix overriding default options with null (@nicolas-grekas)
bug #45531 [Serializer] Fix passing null to str_contains() (@Erwin Dirks)
bug #42458 [Validator][Tests] Fix AssertingContextualValidator not throwing on remaining expectations (@fancyweb)
bug #45496 [VarDumper] Fix dumping mysqli_driver instances (@nicolas-grekas)
bug #45495 [HttpFoundation] Fix missing ReturnTypeWillChange attributes (@luxemate)
bug #45482 [Cache] Add missing log when saving namespace (@developer-av)
bug #45479 [HttpKernel] Reset services between requests performed by KernelBrowser (@nicolas-grekas)
bug #44650 [Serializer] Make document type nodes ignorable (@boenner)
bug #45469 [SecurityBundle] fix autoconfiguring Monolog’s ProcessorInterface (@nicolas-grekas)
bug #45414 [FrameworkBundle] KernelTestCase resets internal state on tearDown (@core23)
bug #45460 [Intl] fix wrong offset timezone PHP 8.1 (@Lenny4)
bug #45462 [HttpKernel] Fix extracting controller name from closures (@nicolas-grekas)
bug #45424 [DependencyInjection] Fix type binding (@sveneld)
bug #44259 [Security] AccountStatusException::$user should be nullable (@Cantepie)
bug #45323 [Serializer] Fix ignored callbacks in denormalization (@benjaminmal)
bug #45399 [FrameworkBundle] Fix sorting bug in sorting of tagged services by priority (@Ahummeling)
bug #45338 [Mailer] Fix string-cast of exceptions thrown by authenticator in EsmtpTransport (@wikando-ck)
bug #45339 [Cache] fix error handling when using Redis (@nicolas-grekas)
bug #45281 [Cache] Fix connecting to Redis via a socket file (@alebedev80)
bug #45289 [FrameworkBundle] Fix log channel of TagAwareAdapter (@fancyweb)
bug #45306 [PropertyAccessor] Add missing TypeError catch (@b1rdex)
bug #44868 [DependencyInjection][FrameworkBundle] Fix using PHP 8.1 enum as parameters (@ogizanagi)
bug #45261 [HttpClient] Fix Content-Length header when possible (@nicolas-grekas)
bug #45258 [DependencyInjection] Don’t dump polyfilled classes in preload script (@nicolas-grekas)
bug #38534 [Serializer] make XmlEncoder stateless thus reentrant (@connorhu)
bug #42253 [Form] Do not fix URL protocol for relative URLs (@bogkonstantin)
bug #45256 [DomCrawler] ignore bad charsets (@nicolas-grekas)
bug #45255 [PropertyAccess] Fix handling of uninitialized property of parent class (@filiplikavcan)
bug #45204 [Validator] Fix minRatio and maxRatio when getting rounded (@alexander-schranz)
bug #45240 [Console] Revert StringInput bc break from #45088 (@bobthecow)

Want to upgrade to this new release? Because Symfony protects
backwards-compatibility very closely, this should be quite easy. Use
SymfonyInsight upgrade reports
to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

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