Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process

At a glance

github.com/xuri/excelize/v2: Amber, patch this week. Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches flatCols, which expands xlsxCol.Min through xlsxCol.Max without enforcing MaxCo…

The flaws

• CVE-2026-107223: Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process (CVSS 7.5 · EPSS 0%)
• CVE-2026-107212: Excelize: Unbounded row number in Rows.Columns makes GetRows and the Rows iterator loop for days (CVSS 7.5 · EPSS 0%)
• CVE-2026-107217: Excelize ColumnNameToNumber: int64 overflow yields an out-of-domain coordinate with nil error, causing negative slice index panic on r="0" rows (CVSS 7.5 · EPSS 0%)
• CVE-2026-107219: Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile (CVSS 7.5 · EPSS 0%)

The fix

Fix: Upgrade github.com/xuri/excelize/v2 to 2.11.1-0.20260807015645-a54c578af309 or later.

Who is exposed: github.com/xuri/excelize/v2 (go) >= 2.1.0, < 2.11.1-0.20260807015645-a54c578af309

Where it stands

• Public proof of concept

Connects to

• Same weakness: CWE-789 (CWE-789). 46 other warnings in 30 days
• Same product: Earlier github.com/xuri/excelize/v2 warnings. 11 in the last 90 days