CVE-2026-107224Medium· 6.5▾ TwilightPoC availableExcelize 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 an…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 35.8 · likelihood 0 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
github.com/xuri/excelize/v2 >= 2.1.0, < 2.11.1-0.20260805032953-db93f8d89de7Patched in:
github.com/xuri/excelize/v2 2.11.1-0.20260805032953-db93f8d89de7Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-107223High· 7.1Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets
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