CVE-2026-21218GHSA-QVHC-9V3J-5RFWBIT-DOTNET-2026-21218BIT-DOTNET-SDK-2026-21218
.NET Spoofing Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 10.0.3, 8.0.24, 9.0.13, 8.0.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Microsoft .NET 10.0
From 10.0.0 · fixed in 10.0.3
- Microsoft .NET 8.0
From 8.0.0 · fixed in 8.0.24
- Microsoft .NET 9.0
From 9.0.0 · fixed in 9.0.13
- System.Security.Cryptography.CoseNuGet
From 8.0.0 · fixed in 8.0.2
- System.Security.Cryptography.CoseNuGet
From 9.0.0 · fixed in 9.0.13
- System.Security.Cryptography.CoseNuGet
From 10.0.0 · fixed in 10.0.3