CVE-2026-55254

MediumCVSS 6.5/10Last modified Aug 18, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-190 CWE-770

Affected software

No affected versions have been published.

Timeline

Published: Jul 17, 2026
Last modified: Aug 18, 2026
NVD status: Analyzed

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