CVE-2026-107222: CWE-129: Improper Validation of Array Index in qax-os excelize
Description
CVE-2026-107222 is a vulnerability in the qax-os excelize Go library versions 2.7.0 through 2.11.0. It involves improper validation of array indexes when extracting conditional formats from Excel spreadsheets. Specifically, malformed conditional formatting rules lacking expected child elements can cause out-of-range indexing or nil dereferences, leading to a panic that terminates the process using the library. No fixed version is currently available.
CVSS v3.1
Score 6.5medium
Affected software
qax-os
excelize
pkg:golang/github.com/qax-os/excelizeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises from the GetConditionalFormats function in the excelize library, which calls extractCondFmtCellIs and indexes ColorScale.Cfvo, DataBar.Cfvo, and DataBar.Color without fully validating the structure of conditional formatting rules. When a crafted worksheet contains cellIs, dataBar, or colorScale rules missing expected children, missing formula, color, value-object, or colorScale data can cause out-of-range array indexing or nil pointer dereferences. This results in a panic that can terminate an unprotected process. The affected versions are from 2.7.0 up to and including 2.11.0. As of the latest review, no patch or fixed version is available.
Potential Impact
An attacker can supply a specially crafted Excel worksheet that triggers the vulnerability when the application calls GetConditionalFormats. This causes the process to panic and terminate unexpectedly, resulting in a denial of service. There is no impact on confidentiality or integrity according to the CVSS vector. The severity is medium with a CVSS score of 6.5.
Mitigation Recommendations
No official fix or patch is currently available for this vulnerability. Users should monitor the vendor's advisories for updates. Until a fix is released, applications using excelize versions 2.7.0 through 2.11.0 should consider validating or sanitizing input Excel files before processing or implementing process-level protections to handle panics gracefully.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-07T14:34:14.816Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac697a62cdf04f65673ff3f
Added to database: 10/07/2026, 19:04:06 UTC
Last enriched: 10/07/2026, 19:18:32 UTC
Last updated: 10/07/2026, 19:18:59 UTC
Views: 6
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