Vulnerabilities CVE-2026-55254

CVE-2026-55254

Medium

Open

TLP:CLEAR

NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation

NVD CVE.org

DDoS

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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.

Details

CVSS Score: 4.8
EPSS Score ⓘ: 0.19%

8.4th percentile
CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Jul 17, 2026
Last Modified: Jul 17, 2026

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