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.
Published: 2026-07-17
Score: 4.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-3w5p-95mh-gq75 NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation
History

Fri, 17 Jul 2026 20:15:00 +0000

Type Values Removed Values Added
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.
Title NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation
Weaknesses CWE-190
CWE-770
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-17T19:55:16.728Z

Reserved: 2026-06-16T16:44:00.625Z

Link: CVE-2026-55254

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses