CVE-2026-83855

Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.3% chance of exploitation in the next 30 days; higher than 70% of CVEs (scores of 2026-10-25)

CWE

CWE-191

Published

2026-10-13

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• microsoft:windows_11_23h2
• microsoft:windows_11_24h2
• microsoft:windows_11_25h2
• microsoft:windows_11_26h1
• microsoft:windows_11_26h2
• microsoft:windows_server_2025

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83855

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