Medium 6.5Published Jul 17, 2026

CVE-2026-55254NCalc is a fast, lightweight expression evaluator for .NET.

Updated under an hour ago (2026-10-19 10:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for ncalc

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-190, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Aug 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ncalc ncalc ncalc:ncalc	before 6.1.1	NVD

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.