Allocation of Resources Without Limits or Throttling Affecting ncalc.core package, versions [,6.1.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-NCALCCORE-17707789
- published30 Jun 2026
- disclosed18 Jun 2026
- creditpawlos
Introduced: 18 Jun 2026
CVE-2026-55254 (opens in a new tab)How to fix?
Upgrade NCalc.Core to version 6.1.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the factorial operator implementation. An attacker can cause excessive CPU consumption or application unresponsiveness by submitting specially crafted expressions with extremely large factorial operands.
Workaround
This vulnerability can be mitigated by not evaluating expressions from untrusted users, validating or sanitizing expressions before evaluation to reject large factorial values, and implementing execution time limits, request timeouts, or cancellation mechanisms around expression evaluation.