CVE-2026-69439
HIGHCVSS 8.8/10EPSS 0.82%
Last modified
CVE-2026-69439 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.. EPSS estimates a 0.82% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | .Net | >= 8.0.0, < 8.0.31 | — |
| Microsoft | .Net | >= 9.0.0, < 9.0.20 | — |
| Microsoft | .Net | >= 10.0.0, < 10.0.12 | — |
| Microsoft | .Net | 11.0.0 | Preview1 |
| Microsoft | Visual Studio 2022 | >= 17.14.0, < 17.14.40 | — |
| Microsoft | Visual Studio 2026 | >= 18.9.0, < 18.9.3 | — |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69439Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-69439?
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
How severe is CVE-2026-69439?
CVE-2026-69439 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.
How do I fix CVE-2026-69439?
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-2026-69439?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST