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CVE-2026-49250 is a denial-of-service vulnerability in @conform-to/dom affecting the parseSubmission functionality when processing FormData or URLSearchParams submissions. According to the provided advisory, the vulnerable behavior is triggered by inputs containing many unique field names. The issue causes excessive synchronous CPU consumption during parsing. The fix description indicates the root cause was inefficient processing that repeatedly looked up values by field name rather than iterating submitted entries directly.
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