qax-os Excelize up to 2.11.0 Conditional Format Extraction GetConditionalFormats null pointer dereference

Summaryinfo

A vulnerability classified as problematic was found in qax-os Excelize up to 2.11.0. This affects the function GetConditionalFormats of the component Conditional Format Extraction. Such manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2026-107222. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in qax-os Excelize up to 2.11.0. It has been rated as problematic. Affected by this issue is the function GetConditionalFormats of the component Conditional Format Extraction. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.7.0 to 2.11.0, conditional-format extraction indexes required child slices or dereferences an optional colorScale child without validating malformed rule structure. GetConditionalFormats reaches extractCondFmtCellIs and also indexes ColorScale.Cfvo, DataBar.Cfvo, and DataBar.Color without complete structural checks. When a crafted worksheet supplies a cellIs, dataBar, or colorScale rule missing expected children and the application calls GetConditionalFormats, missing formula, color, value-object, or colorScale data reaches an out-of-range index or nil dereference, allowing an attacker to panic and terminate an unprotected process. No fixed version is available as of this review.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-107222 since 10/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• qax-os

Name

• Excelize

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11.0

Website

• Product: https://github.com/qax-os/excelize/

CPE 2.3info

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CPE 2.2info

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