ANT-2026-K6DHGAYS · webkit · Heap-buffer-overflow

heap-buffer-overflow critical Severity Claude critical · Security research firm critical · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Trail of Bits. ANT-2026-K6DHGAYS: Heap-buffer-overflow in...

WebKit JavaScriptCore - Out-Of-Bounds Access in FTL JIT due to LICM Moving Array Access Before the Bounds Check

/ While fuzzing JavaScriptCore, I encountered the following JavaScript program which crashes jsc in current HEAD and release /System/Library/Frameworks/JavaScriptCore.framework/Resources/jsc on macOS: / // Run with --thresholdForFTLOptimizeAfterWarmUp=1000 // First array probably required to avoi...