CVE-2026-85870

7.0High

Published 13 Oct 2026 · NVD status: Undergoing 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

Impact

A local attacker with an authenticated account can gain elevated privileges by triggering a heap corruption. They must already have local code execution on the target Windows system.

Root cause

A heap-based buffer overflow flaw exists in the Windows Common Log File System (CLFS) driver.

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 relevant Microsoft security update referenced in advisory CVE-2026-85870 once available; no interim configuration workaround is provided.

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 Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85870

Source: nvd.nist.gov/vuln/detail/CVE-2026-85870