CVE-2026-55254
Medium · 4.8CVSS
4.8
EPSS
0.3%
Published
Jul 17, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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