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CVE Vulnerability Details :
CVE-2026-55254
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-17 Jul, 2026 | 19:55
Updated At-20 Jul, 2026 | 18:07
Rejected At-
▼CVE Numbering Authority (CNA)
NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation

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 Products
Vendor
ncalc
Product
ncalc
Versions
Affected
  • < 6.1.1
Problem Types
TypeCWE IDDescription
CWECWE-770CWE-770: Allocation of Resources Without Limits or Throttling
CWECWE-190CWE-190: Integer Overflow or Wraparound
Type: CWE
CWE ID: CWE-770
Description: CWE-770: Allocation of Resources Without Limits or Throttling
Type: CWE
CWE ID: CWE-190
Description: CWE-190: Integer Overflow or Wraparound
Metrics
VersionBase scoreBase severityVector
3.14.8MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 4.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75
x_refsource_CONFIRM
https://github.com/ncalc/ncalc/pull/575
x_refsource_MISC
https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a
x_refsource_MISC
https://github.com/ncalc/ncalc/releases/tag/v6.1.1
x_refsource_MISC
Hyperlink: https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/ncalc/ncalc/pull/575
Resource:
x_refsource_MISC
Hyperlink: https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a
Resource:
x_refsource_MISC
Hyperlink: https://github.com/ncalc/ncalc/releases/tag/v6.1.1
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found