Integer overflow in Qax-Os Excelize
CVE-2026-107217
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.0.0 to 2.11.0 in github.com/xuri/excelize/v2 and from 1.1.0 to 1.4.1 in github.com/xuri/excelize, ColumnNameToNumber accumulates a bijective base-26 value in int64 without detecting overflow, allowing an invalid long column name to wrap to zero with no error. ColumnNameToNumber accepts the overflowing name VGWQHXLSDVIKWV, after which checkSheetR0 and xlsxWorksheet.checkRow use the wrapped column value as an index. When a crafted worksheet uses an overflowing column name in a row normalized by checkSheetR0 or checkRow, the wrapped zero column becomes a negative slice index during worksheet normalization, allowing an attacker to panic and terminate the calling process. No fixed version is available as of this review.
Published .
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 >= 1.1.0, <= 1.4.1, >= 2.0.0, <= 2.11.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107217?
- CVE-2026-107217 is a high-severity vulnerability in Qax-Os Excelize, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-10-07.
- How severe is CVE-2026-107217?
- High severity. CVSS v3 base score is 7.5 out of 10.