CVE-2026-107223

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.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWE

CWE-789

Published

2026-10-07

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

Affected

• excelize:excelize

Packages (OSV)

References

• https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7
• https://github.com/qax-os/excelize/pull/2370
• https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm

Check your stackJSON