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CVE-2026-54063 is a denial-of-service vulnerability in the Excelize Go library for reading and writing Microsoft Excel spreadsheets. In versions prior to 2.11.0, the worksheet parser path uses an attacker-controlled row index from the worksheet XML row attribute directly during processing in checkSheet() without enforcing Excel's maximum row bound of 1,048,576. Specifically, the parsed row value is used as the length argument to allocate row storage, allowing crafted XLSX content to drive excessive allocation or invalid indexing behavior. Two exploit variants are described: a very large positive row value can trigger an oversized memory allocation attempt leading to process termination from memory exhaustion, and a negative row value can trigger a runtime panic through out-of-bounds slice access. The issue affects applications that open attacker-supplied XLSX files and invoke cell-reading functionality such as GetCellValue on vulnerable versions of excelize/v2.
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Cross-references every affected SKU, including bundled OEM variants.
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