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Vulnerability Details :

CVE-2026-55254

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-17 Jul, 2026 | 19:55
Updated At-17 Jul, 2026 | 19:55
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:17 Jul, 2026 | 19:55
Updated At:17 Jul, 2026 | 19:55
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
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:17 Jul, 2026 | 20:17
Updated At:17 Jul, 2026 | 20:17

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.8MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Type: Secondary
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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-190Primarysecurity-advisories@github.com
CWE-770Primarysecurity-advisories@github.com
CWE ID: CWE-190
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-770
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6asecurity-advisories@github.com
N/A
https://github.com/ncalc/ncalc/pull/575security-advisories@github.com
N/A
https://github.com/ncalc/ncalc/releases/tag/v6.1.1security-advisories@github.com
N/A
https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75security-advisories@github.com
N/A
Hyperlink: https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/ncalc/ncalc/pull/575
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/ncalc/ncalc/releases/tag/v6.1.1
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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