CVE-2026-50312
HIGHCVSS 7.8/10EPSS 0.33%
Last modified
CVE-2026-50312 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.9339 |
| Microsoft | Windows 10 1809 | < 10.0.17763.9020 |
| Microsoft | Windows 10 21h2 | < 10.0.19044.7548 |
| Microsoft | Windows 10 22h2 | < 10.0.19045.7548 |
| Microsoft | Windows 11 24h2 | < 10.0.26100.8875 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.8875 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2269 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2525 |
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | < 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33158 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50312Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-50312?
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-50312?
CVE-2026-50312 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2026-50312?
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.
Related CVEs from 2026
- CVE-2026-50307Use after free in Windows TCP/IP allows an authorized attack…7.8
- CVE-2026-50308Integer underflow (wrap or wraparound) in Windows NTFS allow…7.8
- CVE-2026-50309Heap-based buffer overflow in Windows NTFS allows an authori…7.8
- CVE-2026-5031A vulnerability was found in BichitroGan ISP Billing Softwar…4.3
- CVE-2026-50310Integer overflow or wraparound in Windows Devices Human Inte…4.7
- CVE-2026-50311Improper access control in Windows Server allows an authoriz…7.8
- CVE-2026-50313Heap-based buffer overflow in Windows NTFS allows an unautho…7.8
- CVE-2026-50314Use after free in Microsoft Office allows an unauthorized at…7.8
- CVE-2026-50315Null pointer dereference in Windows Image Acquisition allows…7.8
- CVE-2026-50316Insertion of sensitive information into log file in Windows …5.5
- CVE-2026-50317Concurrent execution using shared resource with improper syn…7
- CVE-2026-50318Stack-based buffer overflow in Windows Resilient File System…7.8
Are you affected by CVE-2026-50312?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST