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CVE-2026-55254

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f3212b7f17833a364ec46fa57dcb1ee225a10431c260268196380e3ceebbaf0a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"ncalc","vendor":"ncalc","versions":[{"status":"affected","version":"< 6.1.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a","tags":["x_refsource_MISC"],"url":"https://github.com/ncalc/ncalc/commit/eeb6155ee1899b1fdf2cda3da35a4f0ca93ffd6a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/references/2
{"name":"https://github.com/ncalc/ncalc/pull/575","tags":["x_refsource_MISC"],"url":"https://github.com/ncalc/ncalc/pull/575"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/references/1
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/references/3
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6addd7d2aa4bd6a765e6cb56d397ce74b4fb243dab33cf06adb3c1ebfbc131c8 · sha256:cd759c4995e97d9d… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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