CVE-2026-107220 Excelize: Panic in cellInRange on a worksheet with an empty mergeCell ref
An attacker can cause a denial of service by providing a crafted Excel file with an empty mergeCell reference, triggering a panic in the Excelize library.
- 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-2026-107220?
CVE-2026-107220 is a medium-severity 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 2.7.1 to 2.11.0, mergeCellsParser leaves the cached rectangle empty for an empty mergeCell ref and then passes that empty slice to cellInRange without a length check. GetCellValue reaches mergeCellsParser, which passes an empty rectangle derived from the mergeCell ref attribute into cellInRange. When a crafted worksheet contains an empty mergeCell ref and a non-streaming cell API reads the worksheet, cellInRange indexes four positions in an empty slice, allowing an attacker to panic on the first affected cell operation. No fixed version is available as of this review.
Which versions are affected by CVE-2026-107220?
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 2.7.1 | 2.11.1-0.20260820023833-99903a3240e5 |
github.com/xuri/excelize/v2 Go | From 2.7.1 | 2.11.1-0.20260820023833-99903a3240e5 |
Products include Excelize Excelize.
How do I fix CVE-2026-107220?
Upgrade github.com/xuri/excelize/v2 to 2.11.1-0.20260820023833-99903a3240e5 or later.
Is CVE-2026-107220 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107220 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-g27h-8qhm-6pff.