CVE-2026-55254
NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 CWE-190 |
| Vendor | ncalc |
| Product | ncalc |
| Published | Jul 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ncalc / ncalc
< 6.1.1