# CVE-2026-59162: qax-os Excelize panic in GetCellValue via negative shared-string index

Source: https://junglewise.ai/threats/cve-2026-59162-qax-os-excelize-panic-in-getcellvalue-via-negative-shared-string  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-59162 · Severity: medium · CVSS 4 · Published 2026-07-10

Excelize is a Go library for reading and writing spreadsheet files in XLSX format. A malicious XLSX file with a negative shared-string cell index can cause the application to crash when reading cell values via common APIs like GetCellValue or GetRows, denying service to legitimate users.

Technologies: [github.com/xuri/excelize (Go)](https://junglewise.ai/threats/technologies/github-com-xuri-excelize), [github.com/xuri/excelize/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-xuri-excelize-v2), [Xuri Excelize](https://junglewise.ai/threats/technologies/excelize). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Xuri](https://junglewise.ai/threats/vendors/xuri).

## Quick answers

**Is CVE-2026-59162 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59162 being exploited in the wild.

**How severe is CVE-2026-59162?** Medium severity, with a CVSS score of 4, published 10 July 2026.

**Which products and versions are affected?** github.com/xuri/excelize (Go) <= 1.4.0, SEMVER:introduced=0,last_affected=1.4.0; github.com/xuri/excelize/v2 (Go) < 2.11.0, SEMVER:introduced=0,fixed=2.11.0; Xuri Excelize < 2.11.0, <= 1.4.0.

**Is there a fix for CVE-2026-59162?** Yes. github.com/xuri/excelize/v2 (Go): upgrade to 2.11.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-59162 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-59162?** Check whether you run github.com/xuri/excelize (Go), github.com/xuri/excelize/v2 (Go) or Xuri Excelize at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/xuri/excelize/v2 (Go): upgrade to 2.11.0 or later

  ```sh
  go get github.com/xuri/excelize/v2@v2.11.0
  ```


## Technical details

The vulnerability is an uncaught exception in the xlsxC.getValueFrom() function. When processing XLSX cells with the shared-string type (t="s"), the code parses the cell value as an integer index and validates only that len(d.SI) > xlsxSI, omitting a lower-bound check for negative indices. A malicious XLSX workbook containing a cell with &lt;v&gt;-1&lt;/v&gt; will cause a panic during GetCellValue() or GetRows() calls without explicit panic recovery. The attack requires the victim application to process an attacker-supplied XLSX file. The fix, released in v2.11.0, adds a bounds check: if xlsxSI >= 0 && xlsxSI < len(d.SI).

## Affected products

- xuri excelize <= 1.4.0
- xuri excelize/v2 < 2.11.0

## Identifiers

- CVE-2026-59162
- GHSA-fx5j-qcqg-grpf
- GO-2026-6452

## Timeline

- 2026-09-10: disclosed: Vulnerability published to GitHub Advisory Database
- 2026-06-21: patched: Patch released in v2.11.0 (commit 93f0b3c)

## References

- [https://api.github.com/users/DavidCarliez](https://api.github.com/users/DavidCarliez)
- [https://github.com/DavidCarliez](https://github.com/DavidCarliez)
- [https://api.github.com/users/DavidCarliez/gists%7B/gist_id%7D](https://api.github.com/users/DavidCarliez/gists%7B/gist_id%7D)
- [https://api.github.com/users/DavidCarliez/repos](https://api.github.com/users/DavidCarliez/repos)
- [https://avatars.githubusercontent.com/u/271374756?v=4](https://avatars.githubusercontent.com/u/271374756?v=4)
- [https://api.github.com/users/DavidCarliez/events%7B/privacy%7D](https://api.github.com/users/DavidCarliez/events%7B/privacy%7D)

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