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CVE-2026-45820: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in 101arrowz fflateCVE-2026-45820
0

fflate versions 0.4.5 through 0.8.0 contain a vulnerability that allows denial of service via an infinite loop in the unzipSync() function. This occurs when processing a crafted ZIP archive with a central directory entry that declares a compressed size of 0xFFFFFFFF but lacks the required ZIP64 extra field tag. The infinite loop is caused by out-of-bounds reads returning undefined, which coerces to zero and keeps the loop condition true indefinitely.

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