Inefficient Algorithmic Complexity Affecting microsoft.netcore.app.runtime.linux-arm package, versions [11.0.0-preview.1.26104.118,11.0.0)
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-MICROSOFTNETCOREAPPRUNTIMELINUXARM-22409064
- published11 Nov 2026
- disclosed10 Nov 2026
- creditArtur Stetsko
Introduced: 10 Nov 2026
NewCVE-2026-120796 (opens in a new tab)How to fix?
Upgrade Microsoft.NETCore.App.Runtime.linux-arm to version 11.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the CreateExtensionDataProperty method in JsonSerializer.Read.HandlePropertyName.cs, which copies the entire existing extension data dictionary into a newly allocated Dictionary even when the existing instance is already a mutable Dictionary. An attacker can force quadratic time and allocation during deserialization by sending an object with a large number of unmapped properties, because LookupProperty invokes the method once per unmapped property and the dictionary being copied grows by one entry each time. Exploitation requires the target type to declare a [JsonExtensionData] property typed IReadOnlyDictionary<string, object> or IReadOnlyDictionary<string, JsonElement>, and that property to be instantiated before deserialization begins, since the copy is skipped when the existing value is null.