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Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-49451

Exact risk observation. Current source statements above are a separate evidence layer. Latest risk evidence.

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.75 % · percentile 54.84 % · scored 1 Nov 2026. Retained older prediction.

Observed 01 Nov 2026 23:58:58 UTC · Complete immutable risk JSON

Immutable source observations

10 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

7 Nov 2026 11:31:50 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

5 Nov 2026 10:41:56 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

3 Nov 2026 10:01:14 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

1 Nov 2026 09:10:37 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

30 Oct 2026 08:52:55 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

28 Oct 2026 07:11:43 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

euvd · EUVD-2026-40365 · Published

27 Oct 2026 13:11:58 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

nvd · CVE-2026-49451 · Published

25 Oct 2026 12:17:38 UTC

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model. From 2.0.0-preview11 until 2.7.5 and 3.5.4, a small OpenAPI docume…

nvd · CVE-2026-49451 · Published

23 Oct 2026 16:01:25 UTC

Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

osv · GHSA-v5pm-xwqc-g5wc · Published

23 Oct 2026 15:48:27 UTC

Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

cve-program · CVE-2026-49451 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 7 Nov 23:01 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current