Resource exhaustion in Excelize
CVE-2026-54063
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Excelize
- Qax-Os Excelize — versions < 2.11.0
Weakness classification (CWE)
References
- github.com/qax-os/excelize/security/advisories/GHSA-h69g-9hx6-f3v4 (Exploit, Vendor Advisory)
- github.com/qax-os/excelize/releases/tag/v2.11.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-54063?
- CVE-2026-54063 is a high-severity vulnerability in Excelize, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-07-10.
- How severe is CVE-2026-54063?
- High severity. CVSS v3 base score is 7.5 out of 10.