Symfony 5.4.43 has just been released.
Here is the list of the most important changes since 5.4.42:

bug #58110 [PropertyAccess] Fix handling property names with a . (@alexandre-daubois)
bug #58127 [Validator] synchronize IBAN formats (@xabbuh)
bug #58112 fix Twig 3.12 compatibility (@xabbuh)
bug #58078 [TwigBridge] Fix Twig deprecation notice (@yceruto)
bug #58000 [DependencyInjection] Fix issue between decorator and service locator index (@lyrixx)
bug #58044 [HttpClient] Do not overwrite the host to request when using option „resolve“ (@xabbuh)
bug #57298 [DependencyInjection] Fix handling of repeated #[Autoconfigure] attributes (@alexandre-daubois)
bug #57493 [SecurityBundle] Make security schema deterministic (@MatTheCat)
bug #58020 [TwigBridge] fix compatibility with Twig 3.12 and 4.0 (@xabbuh)
bug #58002 [Security] Revert stateless check for ContextListener (@VincentLanglet)
bug #57853 [Console] Fix side-effects from running bash completions (@Seldaek)
bug #57997 [Console][PhpUnitBridge][VarDumper] Fix handling NO_COLOR env var (@nicolas-grekas)
bug #57984 [Validator] Add D regex modifier in relevant validators (@alexandre-daubois)
bug #57981 [HttpClient] reject malformed URLs with a meaningful exception (@xabbuh)
bug #57968 [Yaml] :bug: throw ParseException on invalid date (@homersimpsons)
bug #57925 [Validator] reset the validation context after validating nested constraints (@xabbuh)
bug #57920 [Form] Fix handling empty data in ValueToDuplicatesTransformer (@xabbuh)
bug #57917 [HttpKernel] [WebProfileBundle] Fix Routing panel for URLs with a colon (@akeylimepie)
bug #57861 [Form] NumberType: Fix parsing of numbers in exponential notation with negative exponent (@jbtronics)
bug #57921 [Finder] do not duplicate directory separators (@xabbuh)
bug #57895 [Finder] do not duplicate directory separators (@xabbuh)
bug #57905 [Validator] allow more unicode characters in URL paths (@xabbuh)
bug #57899 [String] [EnglishInflector] Fix words ending with le, e.g., articles (@aleho)
bug #57887 [Uid] Ensure UuidV1 is created in lowercase (@smnandre)
bug #57870 [HttpClient] Disable HTTP/2 PUSH by default when using curl (@nicolas-grekas)

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read our upgrade
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