Resource exhaustion in Qax-Os Excelize
CVE-2026-107219
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Qax-Os Excelize — versions >= 2.3.1, <= 2.11.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107219?
- CVE-2026-107219 is a high-severity vulnerability in Qax-Os Excelize, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-10-07.
- How severe is CVE-2026-107219?
- High severity. CVSS v3 base score is 7.5 out of 10.