Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M
CVE-2026-107219Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile
High 7.5
In plain English
A high-severity uncontrolled resource consumption in excelize from qax-os. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/360EntSecGroup-Skylar/excelize/v2 | no fix listed | GO-2026-6681 |
| Go | github.com/xuri/excelize/v2 | 2.11.1-0.20260906004932-2badfcd5841d | GHSA-jrfj-fhj2-jjvm |
| Go | github.com/xuri/excelize/v2 | 2.11.1-0.20260906004932-2badfcd5841d | GO-2026-6681 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/qax-os/excelize/security/advisories/GHSA-jrfj-fhj2-jjvm x_refsource_CONFIRM
- https://github.com/qax-os/excelize/pull/2389 x_refsource_MISC
- https://github.com/qax-os/excelize/commit/2badfcd5841d0d88b0ffea119f5a2f3c53b4910b x_refsource_MISC