CVE-2026-84008 · GHSA-846f-f764-76mx
Microsoft Security Advisory CVE-2026-84008 - .NET Denial of Service Vulnerability
- Risk score
- 71/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.8%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
- Affected
- System.Security.Cryptography.Pkcs (nuget) >= 10.0.0, <= 10.0.12; System.Security.Cryptography.Pkcs (nuget) >= 11.0.0-preview.1, <= 11.0.0-rc.1; System.Security.Cryptography.Pkcs (nuget) >= 8.0.0, <= 8.0.1; System.Security.Cryptography.Pkcs (nuget) >= 9.0.0, <= 9.0.20
- Fix
- Upgrade System.Security.Cryptography.Pkcs to 10.0.13 or 11.0.0-rc.2 or 8.0.2 or 9.0.21 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Story map
At a glance
System.Security.Cryptography.Pkcs: Amber, patch this week. Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
The flaws
- CVE-2026-84008: Microsoft Security Advisory CVE-2026-84008 - .NET Denial of Service Vulnerability (CVSS 7.5 · EPSS 1%)
- CVE-2026-70162: Microsoft Security Advisory CVE-2026-70162 - .NET Denial of Service Vulnerability (CVSS 5.9 · EPSS 1%)
The fix
Fix: Upgrade System.Security.Cryptography.Pkcs to 10.0.13 or 11.0.0-rc.2 or 8.0.2 or 9.0.21 (whichever matches your release line) or later.
Who is exposed: System.Security.Cryptography.Pkcs (nuget) >= 10.0.0, <= 10.0.12; System.Security.Cryptography.Pkcs (nuget) >= 11.0.0-preview.1, <= 11.0.0-rc.1; System.Security.Cryptography.Pkcs (nuget) >= 8.0.0, <= 8.0.1; System.Security.Cryptography.Pkcs (nuget) >= 9.0.0, <= 9.0.20
Where it stands
- No known exploitation
Connects to
- Same weakness: Denial of service (CWE-407). 70 other warnings in 30 days
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
- On your watchlist: .net, NuGet
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| System.Security.Cryptography.Pkcs | nuget | >= 10.0.0, <= 10.0.12 | 10.0.13 |
| System.Security.Cryptography.Pkcs | nuget | >= 11.0.0-preview.1, <= 11.0.0-rc.1 | 11.0.0-rc.2 |
| System.Security.Cryptography.Pkcs | nuget | >= 8.0.0, <= 8.0.1 | 8.0.2 |
| System.Security.Cryptography.Pkcs | nuget | >= 9.0.0, <= 9.0.20 | 9.0.21 |
References
- https://github.com/advisories/GHSA-846f-f764-76mx
- https://github.com/dotnet/runtime/security/advisories/GHSA-846f-f764-76mx
- https://github.com/dotnet/announcements/issues/468
- https://github.com/dotnet/runtime/issues/135703
- https://nvd.nist.gov/vuln/detail/CVE-2026-84008
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008
- https://github.com/advisories/GHSA-846f-f764-76mx
Original description
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
Last activity 13 Oct 2026. Patch Forecast updates every hour.