CVE-2026-83520
HIGHCVSS 8.8/10EPSS 1.27%
Last modified
CVE-2026-83520 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.. EPSS estimates a 1.27% chance of exploitation in the next 30 days.
Description
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .NET 10.0 runtime | >= 10.0.0, < 10.0.13 |
| Microsoft | .NET 11.0 runtime | >= 11.0.0, < 11.0.0-rc.2 |
| Microsoft | .NET 8.0 runtime | >= 8.0.0, < 8.0.32 |
| Microsoft | .NET 9.0 runtime | >= 9.0.0, < 9.0.21 |
| Microsoft | Microsoft .NET Framework 3.5 | >= 3.5.0, < 2.0.50727.9188 AND 3.0.30729.9171 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | >= 3.0.0.0, < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | >= 4.7.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | >= 4.8.0, < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | >= 4.8.1, < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | >= 4.7.0, < 4.7.4150.0 |
| Microsoft | Microsoft .NET Framework 4.8 | >= 4.8.0, < 4.8.4811.0 |
| Microsoft | Microsoft .NET Framework 4.8.1 | >= 4.8.0.0, < 4.8.9363.0 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | >= 17.14.0, < 17.14.42 |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | >= 18.10.0, < 18.10.4 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-83520?
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-83520?
CVE-2026-83520 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.
How do I fix CVE-2026-83520?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-83520?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST