CVE-2026-107221: excelize Memory Corruption

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.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
excelize	excelize	2.0.0 — 2.11.0

References

Advisories & Patches

https://github.com/qax-os/excelize/commit/46a5eb289448e40fbc7d3294589b03861fb822f0 https://github.com/qax-os/excelize/pull/2376 https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv

Exploits

https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv https://github.com/qax-os/excelize/security/advisories/GHSA-8mcq-6wmr-jrjv

Frequently Asked Questions

What is CVE-2026-107221? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-107221? +

CVE-2026-107221 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-107221? +

CVE-2026-107221 affects products from excelize, specifically: excelize. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-107221? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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