CVE-2026-49451Published

Microsoft.OpenAPI: Circular schema references may terminate OpenAPI parsing

cve-program · CVE-2026-49451

Published

OpenAPI.NET

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "microsoft",
                    "product": "OpenAPI.NET",
                    "versions": [
                        {
                            "version": ">= 2.0.0-preview11, < 2.7.5",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.0.0, < 3.5.4",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-40365

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 30, 2026, 4:01:00 PM

dateUpdated: Jun 30, 2026, 6:58:34 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-49451

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-674

Original publisher date fields

published: 2026-06-30T17:16:22.390

lastModified: 2026-10-25T21:10:00.770

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-v5pm-xwqc-g5wc

Published

Microsoft.OpenApi

NuGet

ECOSYSTEM · introduced 2.0.0-preview.11 → fixed 2.7.5

39 explicitly affected versions

2.0.0, 2.0.0-preview1, 2.0.0-preview10, 2.0.0-preview2, 2.0.0-preview3, 2.0.0-preview4, 2.0.0-preview5, 2.0.0-preview6, 2.0.0-preview7, 2.0.0-preview8, 2.0.0-preview9, 2.0.1, 2.1.0, 2.2.0, 2.3.0, 2.3.1, 2.3.10, 2.3.11, 2.3.12, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 2.3.8, 2.3.9, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.5.0, 2.6.0, 2.6.1, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4

Microsoft.OpenApi

NuGet

ECOSYSTEM · introduced 3.0.0 → fixed 3.5.4

15 explicitly affected versions

3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.1, 3.1.2, 3.1.3, 3.2.0, 3.3.0, 3.3.1, 3.4.0, 3.5.0, 3.5.1, 3.5.2, 3.5.3

Original source record · Cite this exact observation · Complete original publisher JSON