High 7.1Published Oct 7, 2026

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

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects qax-os excelize and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 27% of scored CVEs.

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Every CVE for qax-os excelize

Exploited in the last 30 days

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: 7.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.34% (percentile 27)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

qax-os excelize qax_os:excelize (from the name)	from 2.1.0, <= 2.11.0	CNA record
excelize excelize excelize:excelize	from 2.1.0 through 2.11.0	NVD

References

https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gmx-refsource-confirm, exploit, vendor-advisory
https://github.com/qax-os/excelize/pull/2370x-refsource-misc, issue-tracking, patch
https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.