Vulnerability Description
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, the checkSheet() function in github.com/xuri/excelize/v2 uses an attacker-controlled <row r="N"> XML attribute value directly as the length argument to make([]xlsxRow, row) without validating it against the Excel row limit (TotalRows = 1,048,576). A specially crafted XLSX file can trigger two denial-of-service variants: (A) an out-of-memory process kill when r=2147483647 forces a ~16 GB allocation attempt, and (B) a runtime panic via out-of-bounds slice indexing when r=-1. Any service that opens attacker-supplied XLSX files and calls GetCellValue is affected. No authentication is required. This issue is fixed in version 2.11.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Excelize | Excelize | < 2.11.0 |
Related Weaknesses (CWE)
References
- https://github.com/qax-os/excelize/releases/tag/v2.11.0Release Notes
- https://github.com/qax-os/excelize/security/advisories/GHSA-h69g-9hx6-f3v4ExploitVendor Advisory
- https://github.com/qax-os/excelize/security/advisories/GHSA-h69g-9hx6-f3v4ExploitVendor Advisory
FAQ
What is CVE-2026-54063?
CVE-2026-54063 is a vulnerability with a CVSS score of 7.5 (HIGH). Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. Prior to 2.11.0, the checkSheet() function in github.com/xuri/excelize/v2 uses an attacker-controlled <row r="N"...
How severe is CVE-2026-54063?
CVE-2026-54063 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54063?
Check the references section above for vendor advisories and patch information. Affected products include: Excelize Excelize.