CVE-2026-55254

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-190
• CWE-770

• https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6aPatch
• https://github.com/ncalc/ncalc/pull/575Issue Tracking, Patch
• https://github.com/ncalc/ncalc/releases/tag/v6.1.1Product, Release Notes
• https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75Patch, Vendor Advisory

Published

Jul 17, 2026

Last Modified

Aug 18, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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