Patch tracker / KB5082425
KB5082425: .NET Framework 3.5 and 4.8.1 Security Update (April 2026)
KB5082425 is a High security update for .NET Framework 3.5 and 4.8.1, released 2026-04-14. It closes 3 CVEs with a maximum CVSS of 7.5. It is the 17th largest of the 60 updates Microsoft shipped that month, by CVEs closed.
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Update summary
Fixes 3 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 2.1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 has shipped since this one: KB5127693 (2026-10-13). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
KB5082425 patches 3 vulnerabilities in .NET 10.0 on Mac OS and Linux plus .NET 8.0, with the worst rated High Severity at CVSS 7.5, a profile that typically points to denial of service or information disclosure rather than remote code execution. Exposure spans your cross platform .NET runtime and SDK installs, including Linux containers and Mac developer machines that are easy to miss when Windows patching is the focus. Exploitation pressure is currently low, with the highest EPSS at 2 percent and no CISA KEV or ransomware association.
Do this: Inventory Linux and Mac OS hosts running .NET 10.0 and any .NET 8.0 installs, then update those runtimes and rebuild affected container images to the fixed version.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5082425
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5082425
- Released
- 2026-04-14
- Last changed
- 2026-04-14
- Changes tracked
- 1
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Check if KB5082425 is installed
Elevated PowerShell. No output means it is not installed.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-23666 | High | 7.5 | 1.3% | No |
| CVE-2026-33116 | High | 7.5 | 2.1% | No |
| CVE-2026-32226 | Medium | 5.9 | <1% | No |
Scope and sources
- Affected products
- Also released in April 2026
KB5082052
114 CVEs · Critical · exploitedKB5082060
120 CVEs · Critical · exploitedKB5082063
123 CVEs · Critical · exploitedKB5082123
106 CVEs · Critical · exploitedKB5082142
115 CVEs · Critical · exploitedKB5082198
86 CVEs · Critical · exploitedKB5082200
106 CVEs · Critical · exploitedKB5083768
119 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.