Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS) (CVE-2026-54063) | HOL Guard CVE

High · CVSS 7.5CVE-2026-54063GHSA-H69G-9HX6-F3V4

Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS)

Answer in brief

CVE-2026-54063 records a High severity (CVSS 7.5) vulnerability in Excelize: Unbounded Row Index Allocation in Worksheet Parser (checkSheet OOM/Panic DoS). The current sources do not mark it as known exploited. The current feed maps qax-os/excelize (generic), github.com/xuri/excelize/v2 (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 10, 2026Updated Jul 16, 2026Source checked Sep 18, 2026First seen by HOL Jul 10, 2026Material review Jul 16, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps qax-os/excelize (generic), github.com/xuri/excelize/v2 (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
qax-os/excelizegeneric	< 2.11.0	Not reported
github.com/xuri/excelize/v2go	<2.11.0	2.11.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for qax-os/excelize, github.com/xuri/excelize/v2.
Review the reported fix. Update github.com/xuri/excelize/v2 to 2.11.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 10, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.