← WebKit Silent-Fix Report — 2026-W25
54e82182ce Use ThreadSafeRefCounted in RuleSet and StyleResolver
severity medium
class Race
confidence 0.55
WebCore Style
Primitive: non-thread-safe refcount on shared RuleSet
Triage note: Hardens refcount thread-safety for style objects shared across threads, a data-race class fix.
Triage note: Hardens refcount thread-safety for style objects shared across threads, a data-race class fix.
Security-relevant, below the exploitable-grade bar for a full root-cause writeup. The triage verdict is above; the side-by-side patch is below.
Before / after
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