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Vulnerable Software

Vulnerability Details CVE-2026-55254

NCalc is a fast, lightweight expression evaluator for .NET. Prior to 6.1.1, the factorial operator implementation in src/NCalc.Core/Helpers/MathHelper.cs permits specially crafted expressions with extremely large factorial operands, causing excessive CPU consumption or a non-terminating loop due to integer overflow in the factorial calculation logic when applications evaluate untrusted expressions. This issue is fixed in version 6.1.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.5%
CVSS Severity
CVSS v3 Score 4.8
Products affected by CVE-2026-55254
  • Ncalc » Ncalc » Version: 1.3.7
    cpe:2.3:a:ncalc:ncalc:1.3.7
  • Ncalc » Ncalc » Version: 1.3.8
    cpe:2.3:a:ncalc:ncalc:1.3.8
  • Ncalc » Ncalc » Version: 2.0.0
    cpe:2.3:a:ncalc:ncalc:2.0.0
  • Ncalc » Ncalc » Version: 3.0.0
    cpe:2.3:a:ncalc:ncalc:3.0.0
  • Ncalc » Ncalc » Version: 3.1.0
    cpe:2.3:a:ncalc:ncalc:3.1.0
  • Ncalc » Ncalc » Version: 3.10.0
    cpe:2.3:a:ncalc:ncalc:3.10.0
  • Ncalc » Ncalc » Version: 3.11.0
    cpe:2.3:a:ncalc:ncalc:3.11.0
  • Ncalc » Ncalc » Version: 3.12.0
    cpe:2.3:a:ncalc:ncalc:3.12.0
  • Ncalc » Ncalc » Version: 3.13.0
    cpe:2.3:a:ncalc:ncalc:3.13.0
  • Ncalc » Ncalc » Version: 3.13.1
    cpe:2.3:a:ncalc:ncalc:3.13.1
  • Ncalc » Ncalc » Version: 3.2.0
    cpe:2.3:a:ncalc:ncalc:3.2.0
  • Ncalc » Ncalc » Version: 3.3.0
    cpe:2.3:a:ncalc:ncalc:3.3.0
  • Ncalc » Ncalc » Version: 3.4.0
    cpe:2.3:a:ncalc:ncalc:3.4.0
  • Ncalc » Ncalc » Version: 3.5.0
    cpe:2.3:a:ncalc:ncalc:3.5.0
  • Ncalc » Ncalc » Version: 3.6.0
    cpe:2.3:a:ncalc:ncalc:3.6.0
  • Ncalc » Ncalc » Version: 3.7.0
    cpe:2.3:a:ncalc:ncalc:3.7.0
  • Ncalc » Ncalc » Version: 3.8.0
    cpe:2.3:a:ncalc:ncalc:3.8.0
  • Ncalc » Ncalc » Version: 3.9.0
    cpe:2.3:a:ncalc:ncalc:3.9.0
  • Ncalc » Ncalc » Version: 4.0.0
    cpe:2.3:a:ncalc:ncalc:4.0.0
  • Ncalc » Ncalc » Version: 4.1.0
    cpe:2.3:a:ncalc:ncalc:4.1.0
  • Ncalc » Ncalc » Version: 4.2.0
    cpe:2.3:a:ncalc:ncalc:4.2.0
  • Ncalc » Ncalc » Version: 4.2.1
    cpe:2.3:a:ncalc:ncalc:4.2.1
  • Ncalc » Ncalc » Version: 4.3.0
    cpe:2.3:a:ncalc:ncalc:4.3.0
  • Ncalc » Ncalc » Version: 4.3.1
    cpe:2.3:a:ncalc:ncalc:4.3.1
  • Ncalc » Ncalc » Version: 4.3.2
    cpe:2.3:a:ncalc:ncalc:4.3.2
  • Ncalc » Ncalc » Version: 4.3.3
    cpe:2.3:a:ncalc:ncalc:4.3.3
  • Ncalc » Ncalc » Version: 5.0.0
    cpe:2.3:a:ncalc:ncalc:5.0.0
  • Ncalc » Ncalc » Version: 5.1.0
    cpe:2.3:a:ncalc:ncalc:5.1.0
  • Ncalc » Ncalc » Version: 5.10.0
    cpe:2.3:a:ncalc:ncalc:5.10.0
  • Ncalc » Ncalc » Version: 5.11.0
    cpe:2.3:a:ncalc:ncalc:5.11.0
  • Ncalc » Ncalc » Version: 5.12.0
    cpe:2.3:a:ncalc:ncalc:5.12.0
  • Ncalc » Ncalc » Version: 5.13.0
    cpe:2.3:a:ncalc:ncalc:5.13.0
  • Ncalc » Ncalc » Version: 5.2.0
    cpe:2.3:a:ncalc:ncalc:5.2.0
  • Ncalc » Ncalc » Version: 5.2.1
    cpe:2.3:a:ncalc:ncalc:5.2.1
  • Ncalc » Ncalc » Version: 5.2.10
    cpe:2.3:a:ncalc:ncalc:5.2.10
  • Ncalc » Ncalc » Version: 5.2.11
    cpe:2.3:a:ncalc:ncalc:5.2.11
  • Ncalc » Ncalc » Version: 5.2.2
    cpe:2.3:a:ncalc:ncalc:5.2.2
  • Ncalc » Ncalc » Version: 5.2.3
    cpe:2.3:a:ncalc:ncalc:5.2.3
  • Ncalc » Ncalc » Version: 5.2.4
    cpe:2.3:a:ncalc:ncalc:5.2.4
  • Ncalc » Ncalc » Version: 5.2.5
    cpe:2.3:a:ncalc:ncalc:5.2.5
  • Ncalc » Ncalc » Version: 5.2.6
    cpe:2.3:a:ncalc:ncalc:5.2.6
  • Ncalc » Ncalc » Version: 5.2.7
    cpe:2.3:a:ncalc:ncalc:5.2.7
  • Ncalc » Ncalc » Version: 5.2.8
    cpe:2.3:a:ncalc:ncalc:5.2.8
  • Ncalc » Ncalc » Version: 5.2.9
    cpe:2.3:a:ncalc:ncalc:5.2.9
  • Ncalc » Ncalc » Version: 5.3.0
    cpe:2.3:a:ncalc:ncalc:5.3.0
  • Ncalc » Ncalc » Version: 5.3.1
    cpe:2.3:a:ncalc:ncalc:5.3.1
  • Ncalc » Ncalc » Version: 5.4.0
    cpe:2.3:a:ncalc:ncalc:5.4.0
  • Ncalc » Ncalc » Version: 5.4.1
    cpe:2.3:a:ncalc:ncalc:5.4.1
  • Ncalc » Ncalc » Version: 5.4.2
    cpe:2.3:a:ncalc:ncalc:5.4.2
  • Ncalc » Ncalc » Version: 5.5.0
    cpe:2.3:a:ncalc:ncalc:5.5.0
  • Ncalc » Ncalc » Version: 5.6.0
    cpe:2.3:a:ncalc:ncalc:5.6.0
  • Ncalc » Ncalc » Version: 5.7.0
    cpe:2.3:a:ncalc:ncalc:5.7.0
  • Ncalc » Ncalc » Version: 5.8.0
    cpe:2.3:a:ncalc:ncalc:5.8.0
  • Ncalc » Ncalc » Version: 5.9.0
    cpe:2.3:a:ncalc:ncalc:5.9.0
  • Ncalc » Ncalc » Version: 6.0.0
    cpe:2.3:a:ncalc:ncalc:6.0.0
  • Ncalc » Ncalc » Version: 6.1.0
    cpe:2.3:a:ncalc:ncalc:6.1.0


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