CVE-2026-62899
MEDIUMCVSS 5.9/10EPSS 0.72%
Last modified
CVE-2026-62899 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Visual Studio 2022 | >= 17.14.0, < 17.14.38 |
| Microsoft | Visual Studio 2026 | >= 18.8.0, < 18.8.3 |
| Microsoft | .Net | >= 8.0.0, < 8.0.30 |
| Microsoft | .Net | >= 9.0.0, < 9.0.19 |
| Microsoft | .Net | >= 10.0.0, < 10.0.11 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62899Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-62899?
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
How severe is CVE-2026-62899?
CVE-2026-62899 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.
How do I fix CVE-2026-62899?
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-2026-62899?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST