What’s Vulnerable › Vulnerabilities

CVE-2026-107225: Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml

• 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-20

Description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.8.0 to 2.11.0, GetStyle's fill, border, and font extraction predicates check only upper bounds for attacker-controlled style-table indices. File.GetStyle relies on extractStyleCondFuncs predicates that allow negative FillID, BorderID, and FontID values to reach slice indexing. When a crafted styles.xml supplies a negative fillId, borderId, or fontId and the application reads the style, a negative identifier passes the upper-bound-only predicate and becomes a negative slice index, allowing an attacker to panic while reading cell styling. No fixed version is available as of this review.

Affected products

• qax-os excelize: from 2.8.0 through 2.11.0

References

• https://github.com/qax-os/excelize/commit/ae2113b410e51f6a141c396a59eda8c42b91bc22
• https://github.com/qax-os/excelize/pull/2367
• https://github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65
• https://github.com/qax-os/excelize/security/advisories/GHSA-5h23-36rv-pm65

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