Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M
CVE-2026-107223Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process
High 7.1
In plain English
A high-severity security flaw in excelize from qax-os. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches flatCols, which expands xlsxCol.Min through xlsxCol.Max without enforcing MaxColumns. When a crafted worksheet supplies an oversized col max attribute and the application invokes a column mutator, flatCols performs a deep copy and append for every attacker-selected column number, allowing an attacker to consume excessive CPU and memory or trigger OOM. No fixed version is available as of this review.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/360EntSecGroup-Skylar/excelize/v2 | no fix listed | GO-2026-6678 |
| Go | github.com/xuri/excelize/v2 | 2.11.1-0.20260807015645-a54c578af309 | GHSA-fq3v-74gv-27gm |
| Go | github.com/xuri/excelize/v2 | 2.11.1-0.20260807015645-a54c578af309 | GO-2026-6678 |
Affected products (as reported)
Weakness: CWE-789 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm x_refsource_CONFIRM
- https://github.com/qax-os/excelize/pull/2370 x_refsource_MISC
- https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7 x_refsource_MISC