# Microsoft.OpenApi (NuGet) vulnerabilities

1 known vulnerability (1 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 3.11.0 (Oct 19, 2026): no advisory affects it
- Newest unaffected release: 3.11.0 (Oct 19, 2026), the latest release
- Releases: 177 since 1.0.0 (May 8, 2018)
- Registry: https://www.nuget.org/packages/Microsoft.OpenApi
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-49451: 2.0.0-preview.11 to 2.7.4 (2.7.5 is outside it); 3.0.0 to 3.5.3 (3.5.4 is outside it)

## Advisories (1)

### [CVE-2026-49451](https://cve.now/CVE-2026-49451): Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

- Severity: High 7.5
- Published: Jun 30, 2026
- Affected: from 2.0.0-preview.11, fixed in 2.7.5; from 3.0.0, fixed in 3.5.4.
- Fixed in 2.7.5 (released May 26, 2026, 35 days before disclosure) and 3.5.4 (released May 26, 2026, 35 days before disclosure).
- The latest release, 3.11.0, is not affected.

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