CVE-2026-72940
HIGHCVSS 8.8/10EPSS 0.78%
Last modified
CVE-2026-72940 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.. EPSS estimates a 0.78% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 23h2 | < 10.0.22631.7582 |
| Microsoft | Windows 11 24h2 | < 10.0.26100.9445 |
| Microsoft | Windows 11 25h2 | < 10.0.26200.9445 |
| Microsoft | Windows 11 26h1 | < 10.0.28000.2954 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5622 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33438 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72940Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-72940?
Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-72940?
CVE-2026-72940 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72940?
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-2026-72935Out-of-bounds read in Windows NTFS allows an authorized atta…6.7
- CVE-2026-72936Use after free in Windows SMB Client allows an unauthorized …8.1
- CVE-2026-72937Out-of-bounds read in Storage Port Driver allows an authoriz…5.5
- CVE-2026-72938Access of resource using incompatible type ('type confusion'…6.5
- CVE-2026-72939Null pointer dereference in Windows Routing and Remote Acces…6.5
- CVE-2026-7294A flaw has been found in SourceCodester Pizzafy Ecommerce Sy…2.4
- CVE-2026-72941Heap-based buffer overflow in Windows Biometric Service allo…7.8
- CVE-2026-72942Out-of-bounds read in Windows Spaceport.sys allows an unauth…6.5
- CVE-2026-72943Use after free in Windows Deployment Services allows an auth…7.5
- CVE-2026-72944Heap-based buffer overflow in Windows Fax Service allows an …7.8
- CVE-2026-72945Use of uninitialized resource in Windows Task Scheduler allo…5.5
- CVE-2026-72946Heap-based buffer overflow in Storage Port Driver allows an …7.8
Are you affected by CVE-2026-72940?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST