ENVIRONMENT Device : MacBook Pro 16,1 CPU : 6-Core Intel Core i7, 2.6 GHz RAM : 16 GB DDR4 GPU : AMD Radeon Pro 5300M + Intel UHD 630 macOS : 26.5 (Build: 25F71) Xcode : 26 (also tried Xcode 16 — same issue) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ISSUE SUMMARY Xcode crashes immediately on launch after updating to macOS 26.5. The issue started right after the macOS update — Xcode was working perfectly before. Both Xcode 26 and Xcode 16 are affected. Fresh reinstall does not help. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ERROR — xcodebuild -version output dyld: Library not loaded: @rpath/DVTSystemPrerequisites.framework/ Versions/A/DVTSystemPrerequisites Reason: code signature in DVTSystemPrerequisites.framework not valid for use in process — mapping process is a platform binary, but mapped file is not. zsh: abort xcodebuild -version ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ CRASH REPORT DETAILS Incident ID : 370D1162-4CA5-4FFE-9193-45EBD350BF85 Exception : EXC_BAD_ACCESS (SIGKILL — Code Signature Invalid) Termination : CODESIGNING, Code 2, Invalid Page Crash Date : 2026-05-14 Failing Frameworks: DVTSystemPrerequisites.framework MobileDevice.framework (/Library/Apple/System/Library/ PrivateFrameworks/MobileDevice.framework) Crashed Thread 7 Stack: dyld3::MachOFile::trieWalk dyld4::Loader::hasExportedSymbol dyld4::JustInTimeLoader::applyFixups _CFBundleLoadExecutableAndReturnError -[NSBundle loadAndReturnError:] __watchForSims_block_invoke -[OSActivityStream setDeviceDelegate:] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT I HAVE ALREADY TRIED sudo xattr -cr /Applications/Xcode.app sudo codesign --force --deep --sign - /Applications/Xcode.app sudo codesign --force --deep --preserve-metadata=identifier,entitlements --sign - /Applications/Xcode.app Re-signed DVTSystemPrerequisites.framework individually Deleted DerivedData, Xcode caches, preferences Fresh reinstall of Xcode (multiple times) Tried installing Xcode 16 — same crash Raised Apple Support Ticket: 102889658162 — no resolution received Nothing has worked. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ROOT CAUSE ANALYSIS macOS 26.5 introduced stricter platform binary validation in dyld. On Intel Mac (x86_64), this validation is rejecting Xcode's own frameworks at runtime — even after re-signing. This does not appear to be a user-fixable issue. This seems to be a macOS 26.5 regression specifically affecting Intel Mac users. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ REQUEST Is anyone else experiencing this on Intel Mac? Has anyone found a working workaround? Can Apple Engineering please investigate this as a macOS 26.5 regression for Intel Macs? My entire development workflow is blocked. Any help is greatly appreciated. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━