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CVE-2026-95347 is a heap use-after-free in the macOS-specific Google Updater fallback download stream reader. When DownloadStreamReader encounters a failure writing received download data to its destination file, its OnDataAvailable() callback invokes error handling that synchronously destroys the active mojo::DataPipeDrainer. After the callback returns, DataPipeDrainer::ReadData() continues execution and dereferences the destroyed drainer's source member. The defect was introduced in the M152 development cycle in the streamed-download implementation used with the out-of-process fetcher.
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