---
id: "CVE-2026-107216"
kind: "vulnerability"
aliases: ["CVE-2026-107216", "GHSA-wp2g-vpjj-g53r", "GO-2026-6688"]
title: "Mutually-referencing array formulas recurse unboundedly, causing a fatal stack overflow in github.com/xuri/excelize"
severity: "high"
cvss: 7.5
epss: 0.00329
exploited: false
status: "open"
category: "package"
products: [{"name": "github.com/xuri/excelize/v2", "fixed": ["2.11.1-0.20260911060113-ea12859e43c6"], "affected": ">= 2.8.1, < 2.11.1-0.20260911060113-ea12859e43c6", "ecosystem": "go"}]
ecosystems: ["go"]
tags: ["excelize", "file-upload", "go", "package", "spreadsheet-processing"]
not_affected_if: ["no-formula-evaluating-apis", "no-untrusted-formula-evaluation", "versions-outside-2.8.1-to-2.11.0"]
published_at: "2026-10-07T18:17:19+00:00"
first_seen_at: "2026-10-23T19:13:08+00:00"
updated_at: "2026-10-23T19:56:11+00:00"
sources: [{"source": "govuln", "url": "https://pkg.go.dev/vuln/GO-2026-6688", "first_seen_at": "2026-10-23T19:13:08+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-107216", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107216", "first_seen_at": "2026-10-23T19:35:23+00:00"}]
---

# Mutually-referencing array formulas recurse unboundedly, causing a fatal stack overflow in github.com/xuri/excelize

Excelize, a Go library for reading and writing Excel files, has mutually referencing dynamic-array formulas that recurse without limit in versions 2.8.1 through 2.11.0. An attacker who can get a crafted workbook evaluated can crash the whole Go process with a stack overflow.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- go:github.com/xuri/excelize/v2 affected >= 2.8.1, < 2.11.1-0.20260911060113-ea12859e43c6 fixed 2.11.1-0.20260911060113-ea12859e43c6

## How to check

Run `go list -m github.com/xuri/excelize/v2` and check whether the version is between 2.8.1 and 2.11.0.
In go.sum, look for github.com/xuri/excelize/v2 entries in that range.
Check whether the service evaluates formulas from untrusted spreadsheets (CalcCellValue, GetCellValue with calculation, or similar).

## Fix

Upgrade to github.com/xuri/excelize/v2 v2.11.1-0.20260911060113-ea12859e43c6 or later, per the sources' fixed-version field.
The NVD/EPSS text says no fixed version exists yet, so confirm the fix before relying on it.

## Timeline

- 2026-10-23T19:13:08+00:00 govuln https://pkg.go.dev/vuln/GO-2026-6688
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-107216
- 2026-10-23T19:35:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107216

## From the sources

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.8.1 to 2.11.0, ANCHORARRAY recursively calls the exported CalcCellValue function, creating a fresh calculation context at each cycle and bypassing in-flight and iteration controls. ANCHORARRAY calls CalcCellValue instead of cellResolver, so each recursive hop receives a new calcContext and loses cycle state. When mutually referencing dynamic-array formulas are evaluated directly or through formula-evaluating APIs, each recursion hop resets the cycle budget and prevents completion-based caches from breaking the cycle, allowing an attacker to cause a fatal Go stack overflow and abort the process. No fixed version is available as of this review.

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