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    2 vulnerabilities by ncalc

    CVE-2026-55254 (GCVE-0-2026-55254)

    Vulnerability from nvd – Published: 2026-07-17 19:55 – Updated: 2026-07-17 19:55
    VLAI
    Title
    NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation
    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.
    Severity
    4.8 (Medium)
    CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    • CWE-190 - Integer Overflow or Wraparound
    Assigner
    References
    Impacted products
    Vendor Product Version
    ncalc ncalc Affected: < 6.1.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "ncalc",
          "vendor": "ncalc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.1.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190: Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T19:55:16.728Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75"
        },
        {
          "name": "https://github.com/ncalc/ncalc/pull/575",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/pull/575"
        },
        {
          "name": "https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a"
        },
        {
          "name": "https://github.com/ncalc/ncalc/releases/tag/v6.1.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/releases/tag/v6.1.1"
        }
      ],
      "source": {
        "advisory": "GHSA-3w5p-95mh-gq75",
        "discovery": "UNKNOWN"
      },
      "title": "NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55254",
    "datePublished": "2026-07-17T19:55:16.728Z",
    "dateReserved": "2026-06-16T16:44:00.625Z",
    "dateUpdated": "2026-07-17T19:55:16.728Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-55254 (GCVE-0-2026-55254)

    Vulnerability from cvelistv5 – Published: 2026-07-17 19:55 – Updated: 2026-07-17 19:55
    VLAI
    Title
    NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation
    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.
    Severity
    4.8 (Medium)
    CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    • CWE-190 - Integer Overflow or Wraparound
    Assigner
    References
    Impacted products
    Vendor Product Version
    ncalc ncalc Affected: < 6.1.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "ncalc",
          "vendor": "ncalc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.1.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190: Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T19:55:16.728Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ncalc/ncalc/security/advisories/GHSA-3w5p-95mh-gq75"
        },
        {
          "name": "https://github.com/ncalc/ncalc/pull/575",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/pull/575"
        },
        {
          "name": "https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a"
        },
        {
          "name": "https://github.com/ncalc/ncalc/releases/tag/v6.1.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ncalc/ncalc/releases/tag/v6.1.1"
        }
      ],
      "source": {
        "advisory": "GHSA-3w5p-95mh-gq75",
        "discovery": "UNKNOWN"
      },
      "title": "NCalc: Denial of Service via Unbounded and Non-Terminating Factorial Evaluation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55254",
    "datePublished": "2026-07-17T19:55:16.728Z",
    "dateReserved": "2026-06-16T16:44:00.625Z",
    "dateUpdated": "2026-07-17T19:55:16.728Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}