Security Advisory

CVE-2026-55254

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-17 19:55:16

Last updated 2026-07-20 18:07:31

Assigner GitHub_M

CVSS score 4.8

State PUBLISHED

Description

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.

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