Inefficient Algorithmic Complexity Affecting microsoft.extensions.validation package, versions [11.0.0-rc.1.26425.128, 11.0.0)
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-MICROSOFTEXTENSIONSVALIDATION-22412169
- published11 Nov 2026
- disclosed9 Nov 2026
- creditAlejandro Pacheco,Artur Stetsko
Introduced: 9 Nov 2026
NewCVE-2026-118749 (opens in a new tab)How to fix?
Upgrade Microsoft.Extensions.Validation to version 11.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the ValidateContext.ValidationErrors getter, which rebuilds the entire validation-error dictionary on every access instead of returning the existing one. An attacker can drive quadratic CPU consumption by submitting a request whose attacker-controlled collection produces many validation errors, and the work continues on the server after the client disconnects. Reaching this requires a Minimal API endpoint that uses the built-in validation feature.