---
id: CVE-2026-107224
title: >-
  Excelize is a Go language library for reading and writing Microsoft Excel
  spreadsheets
summary: >-
  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 an…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
  - CWE-681
vendor: xuri
product: github.com/xuri/excelize/v2
affected:
  - 'github.com/xuri/excelize/v2 >= 2.1.0, < 2.11.1-0.20260805032953-db93f8d89de7'
patched:
  - github.com/xuri/excelize/v2 2.11.1-0.20260805032953-db93f8d89de7
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:17:11.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107224'
references:
  - url: >-
      https://github.com/qax-os/excelize/commit/db93f8d89de71589069a54d1b998af02e3c5f7cd
    label: security-advisories@github.com
  - url: 'https://github.com/qax-os/excelize/pull/2369'
    label: security-advisories@github.com
  - url: 'https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw'
    label: security-advisories@github.com
  - url: 'https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-fw94-4wwp-w8pw'
tags:
  - nvd
  - ghsa
  - go
  - cve.org
  - exploit-available
aliases:
  - GHSA-fw94-4wwp-w8pw
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T19:29:38.692124Z'
ingestedAt: '2026-10-07T20:46:46.977Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-107224)

Affected packages:

- `github.com/xuri/excelize/v2 >= 2.1.0, < 2.11.1-0.20260805032953-db93f8d89de7`

Patched in:

- `github.com/xuri/excelize/v2 2.11.1-0.20260805032953-db93f8d89de7`

Source: https://github.com/advisories/GHSA-fw94-4wwp-w8pw