Buffer overflow in Qax-Os Excelize
CVE-2026-107221
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.0.0 to 2.11.0, checkRow sizes its target cell slice from the last cell in XML document order and then re-scatters every cell by its explicit column reference. GetCellValue reaches workSheetReader and checkRow, where targetList is too short for an earlier out-of-order cell. When a crafted row places a higher-column cell before a lower-column final cell and a non-streaming worksheet API reads the sheet, the earlier cell's column index exceeds the slice length derived from the final cell, allowing an attacker to cause an unrecovered panic and terminate the process. No fixed version is available as of this review.
Vulnerability class: Buffer Overflow
Published · last modified .
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 >= 2.0.0, <= 2.11.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107221?
- CVE-2026-107221 is a medium-severity vulnerability in Qax-Os Excelize, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-10-07.
- How severe is CVE-2026-107221?
- Medium severity. CVSS v3 base score is 6.5 out of 10.