[Webkit-unassigned] [Bug 53405] New: XSS Auditor is spinning inside decodeURLEscapeSequences() if there are percent signs in large posted data

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=53405

           Summary: XSS Auditor is spinning inside
                    decodeURLEscapeSequences() if there are percent signs
                    in large posted data
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org
                CC: abarth at webkit.org


We're seeing frequent freezes on an Apple internal web site after submitting a form - usually about half a minute for a small page. This seems to be a different issue than bug 49845 - here we aren't rebuilding the tree, but each check is extremely slow.

Attaching a reduced test case.

<rdar://problem/8227019>

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