Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
1 version affected across 4 products
| Date | Total | Labels |
|---|
| 2026-02-10 | 4 | Disclosure2Patch2 |
| 2026-02-11 | 1 | Disclosure1 |
| 2026-02-12 | 1 | Disclosure1 |
CVE-2026-21218 Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network. https://www.cve.org/CVERecord?id=CVE-2026-21218
Post summary
The post references CVE-2026-21218 as a .NET vulnerability enabling spoofing, but offers no PoC, exploit code, patch, or evidence of active use.
🚨 #Ubuntu .NET CRITICAL 🚨 CVE-2026-21218 lets attackers bypass crypto checks in http://System.Security.Cryptography.Cose. Affects: .NET 8/9/10 on Ubuntu 25.10 & 22.04 LTS. Read more: 👉 https://tinyurl.com/34ny5waj #Security https://t.co/XDQhopPHOb
Post summary
The tweet announces CVE-2026-21218, a critical .NET vulnerability that allows bypassing crypto checks on Ubuntu, affecting .NET 8/9/10. No PoC, exploit, active use, patch, or debunking information is provided.
CVE Alert: CVE-2026-21218 - Microsoft - .NET 10.0 - https://www.redpacketsecurity.com/cve-alert-cve-2026-21218-microsoft-net-10-0/ #OSINT #ThreatIntel #CyberSecurity #cve-2026-21218 #microsoft #net-10-0
Post summary
The post announces CVE-2026-21218 and provides a link to a CVE alert page, but offers no further technical or exploit information.
February 2026 servicing: .NET gets critical security fixes (CVE-2026-21218) across 8.0/9.0/10.0 with 10.0.3/9.0.13/8.0.24; .NET Framework has no new updates this month. Patch now to shield your apps. — Rahul Bhandari (MSFT), Tara Overfield https://ift.tt/jZ0ulMK
Post summary
The announcement focuses on releasing critical security patches for .NET 8.0/9.0/10.0 to address CVE-2026-21218.
February 2026 servicing updates for .NET and .NET Framework bring security fixes across 10.0, 9.0, and 8.0, including CVE-2026-21218. Updates: 10.0.3, 9.0.13, 8.0.24 for installers, binaries, containers, Linux. No new .NET Framework updates this month. … https://ift.tt/jZ0ulMK
Post summary
Microsoft released February 2026 servicing updates for .NET and .NET Framework, including fixes for CVE-2026-21218 across multiple version lines.
CVE-2026-21218 .NET Spoofing Vulnerability http://dlvr.it/TQtFwp
Post summary
A brief announcement of CVE-2026-21218, a .NET spoofing vulnerability, accompanied by a link that may contain additional details.
4 of 4 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| OS | apple | macos | - | - | - |
| OS | linux | linux_kernel | - | - | - |
| App | microsoft | .net | - | - | - |
| OS | microsoft | windows | - | - | - |