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No exploitation reportedFix available

CVE-2026-115943

Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt

No exploitation reported by the sources we read.

  • Published2026-10-29
  • WeaknessCWE-95

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-10-2921:37CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-30

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libspreadsheet-xlsx-perlUbuntu:26.10all versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:26.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:24.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:22.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:20.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:18.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlUbuntu:16.04:LTSall versions · no fixed version listed
  • libspreadsheet-xlsx-perlDebian:14all versions · fixed in 0.20-1

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-115943 Red Hat Product Security

    perl-spreadsheet-xlsx: Spreadsheet::XLSX: Arbitrary code execution via crafted number format conditions

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-10-29
Last Modified
2026-11-05
NVD status
Deferred
GitHub Advisory
GHSA-h33r-pwjw-x33j

Frequently asked questions

What is CVE-2026-115943?

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.

Is CVE-2026-115943 actively exploited?

Active exploitation of CVE-2026-115943 has not been confirmed. Its EPSS score was 0.3% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-115943?

CVE-2026-115943 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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