Allocation of Resources Without Limits or Throttling Affecting microsoft.aspnetcore.webutilities package, versions [2.3.0,2.3.14)
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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Start learning- Snyk IDSNYK-DOTNET-MICROSOFTASPNETCOREWEBUTILITIES-22409069
- published11 Nov 2026
- disclosed10 Nov 2026
- creditNavSec4
Introduced: 10 Nov 2026
NewCVE-2026-118750 (opens in a new tab)How to fix?
Upgrade Microsoft.AspNetCore.WebUtilities to version 2.3.14 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the FileBufferingReadStream constructor, which eagerly rents a buffer of memoryThreshold bytes for every stream it creates. An attacker can exhaust server memory by sending multipart-form requests whose many sections each cause a full-size buffer to be pre-allocated regardless of how little data each section carries. Reaching this requires an endpoint that reads multipart or form request bodies, which wraps each section in a FileBufferingReadStream through MultipartReader or the Microsoft.AspNetCore.Http form-reading path.