CVE-2026-103577
HIGHCVSS 7.5/10
Last modified
CVE-2026-103577 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network..
Description
Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 version 23H2 | >= 10.0.22631.0, < 10.0.22631.7652 |
| Microsoft | Windows 11 Version 23H2 | >= 10.0.22631.0, < 10.0.22631.7652 |
| Microsoft | Windows 11 Version 24H2 | >= 10.0.26100.0, < 10.0.26100.9711 |
| Microsoft | Windows 11 Version 25H2 | >= 10.0.26200.0, < 10.0.26200.9711 |
| Microsoft | Windows 11 version 26H1 | >= 10.0.28000.0, < 10.0.28000.3231 |
| Microsoft | Windows 11 Version 26H2 | >= 10.0.26300.0, < 10.0.26300.9711 |
| Microsoft | Windows Server 2022 | >= 10.0.20348.0, < 10.0.20348.5761 |
| Microsoft | Windows Server 2025 | >= 10.0.26100.0, < 10.0.26100.33650 |
| Microsoft | Windows Server 2025 (Server Core installation) | >= 10.0.26100.0, < 10.0.26100.33650 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-103577?
Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network.
How severe is CVE-2026-103577?
CVE-2026-103577 has a CVSS score of 7.5/10 (HIGH severity).
How do I fix CVE-2026-103577?
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-2026-103577?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST