CVE-2026-45491

Description

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

How to fix CVE-2026-45491

To remediate CVE-2026-45491, upgrade the affected package to a fixed version below.

• NuGet/Microsoft.NETCore.App.Runtime.linux-x64—upgrade to 8.0.28 or later
• NuGet/Microsoft.NETCore.App.Runtime.osx-arm64—upgrade to 8.0.28 or later
• —upgrade to 8.0.28 or later

Is CVE-2026-45491 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• >= 8.0.0, < 8.0.28
• >= 8.0.0, < 8.0.28
• >= 8.0.0, < 8.0.28

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-45491
• PATCHgithub.com/dotnet/runtime
• WEBgithub.com/dotnet/announcements/issues/404
• WEBgithub.com/dotnet/runtime/security/advisories/GHSA-7q4v-2mr6-5gpx
• WEB