CVE-2026-107221 Excelize: a row whose earlier cell has a higher column reference than its last cell panics index out of range on almost every worksheet read API
A crafted Excel file causes a panic in the Excelize Go library, terminating the application during worksheet reading.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-107221?
CVE-2026-107221 is a medium-severity denial of service vulnerability in qax-os excelize, published on 7 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-107221?
2 open source packages ship an affected version, including github.com/xuri/excelize/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/xuri/excelize/v2 Go | From 2.0.0 | 2.11.1-0.20260816084418-46a5eb289448 |
github.com/xuri/excelize/v2 Go | From 2.0.0 | 2.11.1-0.20260816084418-46a5eb289448 |
Products include Excelize Excelize.
How do I fix CVE-2026-107221?
Upgrade github.com/xuri/excelize/v2 to 2.11.1-0.20260816084418-46a5eb289448 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-107221 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107221 exists.
Other vulnerabilities in qax-os excelize
- CVE-2026-107211 Excelize: Unchecked pivot-cache field index in extractPivotTableFields causes unrecoverable panic
- CVE-2026-107213 Excelize: Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no drawing element
- CVE-2026-59161 Excelize: Streaming GetRows row-bound bypass causes attacker-controlled allocation
- CVE-2026-107212 Excelize: Unbounded row number in Rows.Columns makes GetRows and the Rows iterator loop for days
- CVE-2026-107214 Excelize Decrypt: unrecoverable panics on malformed OLE/CFB encrypted workbooks
Sources
Also known as GHSA-8mcq-6wmr-jrjv.