Detections
Analytics
CVE-2026-55254
medium
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.
References
https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75
https://github.com/ncalc/ncalc/releases/tag/v6.1.1
https://github.com/ncalc/ncalc/pull/575
https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a