Improper input validation in Qax-Os Excelize
CVE-2026-107225
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.8.0 to 2.11.0, GetStyle's fill, border, and font extraction predicates check only upper bounds for attacker-controlled style-table indices. File.GetStyle relies on extractStyleCondFuncs predicates that allow negative FillID, BorderID, and FontID values to reach slice indexing. When a crafted styles.xml supplies a negative fillId, borderId, or fontId and the application reads the style, a negative identifier passes the upper-bound-only predicate and becomes a negative slice index, allowing an attacker to panic while reading cell styling. No fixed version is available as of this review.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 >= 2.8.0, <= 2.11.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107225?
- CVE-2026-107225 is a medium-severity vulnerability in Qax-Os Excelize, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-10-07.
- How severe is CVE-2026-107225?
- Medium severity. CVSS v3 base score is 6.5 out of 10.