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TI-2026-82782 Aliases CVE-2026-115943GHSA-h33r-pwjw-x33j

Code execution in Spreadsheet::XLSX via eval of number format conditions

Priority MEDIUM 50CWE-95Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-95.

Summary

Spreadsheet::XLSX versions before 0.19 for Perl evaluate number format conditions from the workbook as string eval code. When a number format contains a condition such as [>100], ExcelFmt passes that condition and the cell value to a string eval while Spreadsheet::XLSX->new parses the file, a flaw tracked as CWE-95. An unauthenticated remote attacker who supplies a crafted XLSX file can run arbitrary Perl code.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt. When a number format has a condition such as [>100], ExcelFmt chooses the format section by passing the condition and the cell value to a string eval. Both come from the workbook, and the eval runs while Spreadsheet::XLSX->new parses it. An attacker who supplies an XLSX file can run arbitrary Perl code.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0061 49th percentileScored 2026-11-07
Fix Fixed Spreadsheet-XLSX: 0.19

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Spreadsheet-XLSXbefore 0.190.19Patch availableCNA
  • Spreadsheet-XLSX Vendor— Affected before 0.19 Fixed in 0.19 Patch available CNA

Remediation

Update Spreadsheet-XLSX to version 0.19 or later, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Spreadsheet-XLSX Fixed in 0.19

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-115943
  2. 2026-10-30 Alias added: GHSA-h33r-pwjw-x33j
  3. 2026-10-30 Affected versions changed · Red Hat
  4. 2026-10-30 CVSS score added · Red Hat
  5. 2026-11-05 CVSS score added · CISA ADP
  6. 2026-11-05 CISA SSVC decision points changed
  7. 2026-11-05 Priority changed: LOW → MEDIUM

References

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences