Unknown severity · Source severity not reportedCVE-2026-115943

Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmtCVE-2026-115943

Answer in brief

CVE-2026-115943 records a Unknown severity vulnerability in Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt. The current sources do not mark it as known exploited. The current feed maps Spreadsheet-XLSX (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 29, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 29, 2026Material review Oct 29, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Spreadsheet-XLSX (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Spreadsheet-XLSXgeneric	>=0 <0.19	0.19

Recommended response

Check inventory. Check lockfiles and deployed manifests for Spreadsheet-XLSX.
Review the reported fix. Source-reported solution: Upgrade to Spreadsheet-XLSX 0.19 or later.

Evidence timeline and material changes

Published upstream
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 29, 2026

Sources and claim methodology

Source referencemetacpan.org

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.