What’s Vulnerable › Vulnerabilities

CVE-2026-107220: Excelize: Panic in cellInRange on a worksheet with an empty mergeCell ref

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-07 · updated 2026-10-13
• Weakness: CWE-125

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.

Affected products

• qax-os excelize: from 2.7.1 through 2.11.0

References

• https://github.com/qax-os/excelize/commit/99903a3240e58a47ff28fb8e05a03bd9d496ec24
• https://github.com/qax-os/excelize/pull/2379
• https://github.com/qax-os/excelize/security/advisories/GHSA-g27h-8qhm-6pff
• https://github.com/qax-os/excelize/security/advisories/GHSA-g27h-8qhm-6pff

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