CVE-2026-62889
HIGHCVSS 8.1/10EPSS 0.56%
Last modified
CVE-2026-62889 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Double free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.
Description
Double free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.9418 |
| Microsoft | Windows 10 1809 | < 10.0.17763.9115 |
| Microsoft | Windows 10 21h2 | < 10.0.19044.7663 |
| Microsoft | Windows 10 22h2 | < 10.0.19045.7663 |
| Microsoft | Windows 11 23h2 | < 10.0.22631.7517 |
| Microsoft | Windows 11 24h2 | < 10.0.26100.9106 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.9106 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2704 |
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.9418 |
| Microsoft | Windows Server 2019 | < 10.0.17763.9115 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5440 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33222 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62889Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-62889?
Double free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-62889?
CVE-2026-62889 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.
How do I fix CVE-2026-62889?
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-2026-62882Insufficiently protected credentials in Microsoft Office Out…4.3
- CVE-2026-62883Numeric truncation error in Windows DNS allows an authorized…6.7
- CVE-2026-62885Heap-based buffer overflow in Windows Win32K allows an autho…7.8
- CVE-2026-62886Integer overflow or wraparound in .NET allows an unauthorize…7.8
- CVE-2026-62887Out-of-bounds read in Windows NTFS allows an authorized atta…5.5
- CVE-2026-62888Use after free in Windows DWM Core Library allows an authori…7.8
- CVE-2026-62890Heap-based buffer overflow in Windows GDI+ allows an authori…7.8
- CVE-2026-62892Use after free in Capability Access Management Service (cams…7
- CVE-2026-62893Use after free in Windows Deployment Services allows an unau…9.8
- CVE-2026-62894Heap-based buffer overflow in Windows DWM Core Library allow…7.8
- CVE-2026-62895Permissive cross-domain policy with untrusted domains in Azu…8.8
- CVE-2026-62896Improper authentication in Microsoft Teams allows an authori…9.6
Are you affected by CVE-2026-62889?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST