EUVD-2026-7347Published

.NET Spoofing Vulnerability

cve-program · CVE-2026-21218

Published

.NET 10.0

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": ".NET 10.0",
                    "versions": [
                        {
                            "version": "10.0.0",
                            "lessThan": "10.0.3",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

.NET 8.0

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": ".NET 8.0",
                    "versions": [
                        {
                            "version": "8.0.0",
                            "lessThan": "8.0.24",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

.NET 9.0

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": ".NET 9.0",
                    "versions": [
                        {
                            "version": "9.0.0",
                            "lessThan": "9.0.13",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

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

euvd · EUVD-2026-7347

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: Feb 10, 2026, 5:51:23 PM

dateUpdated: Aug 19, 2026, 4:25:55 PM

3 related source bulletins · separate from aliases

msrc_CVE-2026-21218: .NET Spoofing Vulnerability

CVE-2026-21218

NCSC-2026-0056: Kwetsbaarheden verholpen in Microsoft Developer Tools

CVE-2026-21518 · CVE-2026-21523 · CVE-2026-21218 · CVE-2026-21257 · CVE-2026-21256 · CVE-2026-21516

WID-SEC-W-2026-0367: Microsoft DeveloperTools (Visual Studio Code und .NET): Mehrere Schwachstellen

CVE-2026-21218 · CVE-2026-21256 · CVE-2026-21257 · CVE-2026-21518 · CVE-2026-21523

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-2026-21218

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: Analyzed

Weakness classifications: CWE-166

Original publisher date fields

published: 2026-02-10T18:16:22.967

lastModified: 2026-06-17T10:18:17.917

4 source CPE criteria · context only

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

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

osv · GHSA-qvhc-9v3j-5rfw

Published

System.Security.Cryptography.Cose

NuGet

ECOSYSTEM · introduced 8.0.0 → fixed 8.0.2

2 versions listed as affected

8.0.0, 8.0.1

System.Security.Cryptography.Cose

NuGet

ECOSYSTEM · introduced 9.0.0 → fixed 9.0.13

13 versions listed as affected

9.0.0, 9.0.1, 9.0.10, 9.0.11, 9.0.12, 9.0.2, 9.0.3, 9.0.4, 9.0.5, 9.0.6, 9.0.7, 9.0.8, 9.0.9

System.Security.Cryptography.Cose

NuGet

ECOSYSTEM · introduced 10.0.0 → fixed 10.0.3

3 versions listed as affected

10.0.0, 10.0.1, 10.0.2

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