CVE-2026-40415 json
Windows TCP/IP Remote Code Execution Vulnerability
published 2026-05-12 5 mo ago modified 2026-08-10 2 mo ago also EUVD-2026-29672
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
Use after free in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
Patch / fix
- Microsoft Windows 10 Version 1809 10.0.17763.8755
- Microsoft Windows 10 Version 21H2 10.0.19044.7291
- Microsoft Windows 10 Version 22H2 10.0.19045.7417
- Microsoft Windows 11 version 23H2 10.0.22631.7079, 10.0.22631.7219
- Microsoft Windows 11 Version 24H2 10.0.26100.8457
- Microsoft Windows 11 Version 25H2 10.0.26200.8457
- Microsoft Windows 11 version 26H1 10.0.28000.2113
- Microsoft Windows Server 2019 10.0.17763.8755
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.8755
- Microsoft Windows Server 2022 10.0.20348.5139
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330
- Microsoft Windows Server 2025 10.0.26100.32860
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32860
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 21H2
- Microsoft Windows 10 Version 22H2
- Microsoft Windows 11 version 23H2
- Microsoft Windows 11 Version 24H2
- Microsoft Windows 11 Version 25H2
- Microsoft Windows 11 version 26H1
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows Server 2022
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-40415
vendor-advisory, patch
Sources
- CVE List CVE-2026-40415
- NVD CVE-2026-40415
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.