CVE-2026-72940
Analyzed
Analyzed - Analysis Complete
Heap-based Buffer Overflow in Windows Schannel
Vulnerability report for CVE-2026-72940, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-08
Last updated on: 2026-09-22
Assigner: Microsoft Corporation
Description
Description
Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2025 | to 10.0.26100.33438 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7582 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7582 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.9445 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.9445 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.9445 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.9445 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2954 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2954 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.5622 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-122 | A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). |
