Vulnerability Details CVE-2026-107224
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, a Zip64 uncompressed size with the high bit set is converted from uint64 to a negative int64 before signed size-limit checks and allocation. ReadZipReader obtains UncompressedSize64 through FileInfo.Size and passes the wrapped negative value to readFile. When a crafted Zip64 entry declares an uncompressed size from 2^63 through 2^64-1 and the workbook is opened, the negative size bypasses unzip limits and reaches make as a negative capacity, allowing an attacker to panic during workbook opening. No fixed version is available as of this review.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 27.5%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-107224
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cpe:2.3:a:excelize:excelize:2.1.0
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cpe:2.3:a:excelize:excelize:2.10.0
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cpe:2.3:a:excelize:excelize:2.10.1
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cpe:2.3:a:excelize:excelize:2.11.0
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cpe:2.3:a:excelize:excelize:2.2.0
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cpe:2.3:a:excelize:excelize:2.3.0
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cpe:2.3:a:excelize:excelize:2.3.1
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cpe:2.3:a:excelize:excelize:2.3.2
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cpe:2.3:a:excelize:excelize:2.4.0
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cpe:2.3:a:excelize:excelize:2.4.1
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cpe:2.3:a:excelize:excelize:2.5.0
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cpe:2.3:a:excelize:excelize:2.6.0
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cpe:2.3:a:excelize:excelize:2.6.1
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cpe:2.3:a:excelize:excelize:2.7.0
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cpe:2.3:a:excelize:excelize:2.7.1
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cpe:2.3:a:excelize:excelize:2.8.0
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cpe:2.3:a:excelize:excelize:2.8.1
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cpe:2.3:a:excelize:excelize:2.9.0
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cpe:2.3:a:excelize:excelize:2.9.1