CVE-2026-83871

7.0High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

7.0High

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-122, CWE-367

Impact

A local attacker with existing user credentials can elevate privileges to SYSTEM. They need prior local access or valid credentials on the target Windows machine.

Root cause

A heap-based buffer overflow triggered under race conditions allows memory corruption and unauthorized privilege escalation.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the latest Microsoft security update addressing this advisory, or temporarily stop and disable the OpenSSH SSH Server service (sshd) if patching cannot be done immediately.

shell

$ powershell -Command "Stop-Service sshd; Set-Service -Name sshd -StartupType Disabled"

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Heap-based buffer overflow in OpenSSH for Windows allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83871

Source: nvd.nist.gov/vuln/detail/CVE-2026-83871