CVE-2026-59162: CWE-248: Uncaught Exception in qax-os excelize
Excelize, a Go library for handling Microsoft Excel files, has a vulnerability prior to version 2.11.0 where parsing shared-string cell values can cause an uncaught exception. Specifically, if a shared-string cell contains the value -1, the library attempts to index sharedStrings[-1], leading to a panic when using GetCellValue or GetRows. This issue is fixed in version 2.11.0.
AI Analysis
Technical Summary
The vulnerability in Excelize versions before 2.11.0 arises from improper bounds checking when parsing shared-string cell values. The library uses strconv.Atoi to convert cell values and only checks the upper bound before indexing the shared string slice. This allows an XLSX file with a shared-string cell value of -1 to cause an out-of-bounds access (sharedStrings[-1]), triggering a panic (uncaught exception) during calls to GetCellValue or GetRows. The issue is addressed in Excelize 2.11.0.
Potential Impact
An attacker can craft a malicious XLSX file containing a shared-string cell with the value -1, which causes the Excelize library to panic due to an out-of-bounds slice access. This results in a denial of service (application crash) when the file is processed. There is no indication of code execution or data corruption beyond the panic.
Mitigation Recommendations
Upgrade to Excelize version 2.11.0 or later, where this issue is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 2.11.0. No other mitigations are specified or required.
CVE-2026-59162: CWE-248: Uncaught Exception in qax-os excelize
Description
Excelize, a Go library for handling Microsoft Excel files, has a vulnerability prior to version 2.11.0 where parsing shared-string cell values can cause an uncaught exception. Specifically, if a shared-string cell contains the value -1, the library attempts to index sharedStrings[-1], leading to a panic when using GetCellValue or GetRows. This issue is fixed in version 2.11.0.
CVSS v4.0
Score 6.9medium
Affected software
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 in Excelize versions before 2.11.0 arises from improper bounds checking when parsing shared-string cell values. The library uses strconv.Atoi to convert cell values and only checks the upper bound before indexing the shared string slice. This allows an XLSX file with a shared-string cell value of -1 to cause an out-of-bounds access (sharedStrings[-1]), triggering a panic (uncaught exception) during calls to GetCellValue or GetRows. The issue is addressed in Excelize 2.11.0.
Potential Impact
An attacker can craft a malicious XLSX file containing a shared-string cell with the value -1, which causes the Excelize library to panic due to an out-of-bounds slice access. This results in a denial of service (application crash) when the file is processed. There is no indication of code execution or data corruption beyond the panic.
Mitigation Recommendations
Upgrade to Excelize version 2.11.0 or later, where this issue is fixed. Patch status is confirmed by the vendor advisory indicating the fix in 2.11.0. No other mitigations are specified or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-02T16:50:27.887Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a511ed668715ace43d68a10
Added to database: 07/10/2026, 16:33:26 UTC
Last enriched: 07/10/2026, 16:48:12 UTC
Last updated: 07/10/2026, 16:48:12 UTC
Views: 3
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