CVE-2026-55254
4.8
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ncalc | ncalc | < 6.1.1 | affected |
Weaknesses
- CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling
- CWE-190: CWE-190: Integer Overflow or Wraparound
References
- https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75
- https://github.com/ncalc/ncalc/pull/575
- https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a
- https://github.com/ncalc/ncalc/releases/tag/v6.1.1
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