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CVE-2026-83862

8.8 high SSVC exploitation: none Modified
NVD · CVE.org

Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over an adjacent network.

Fix

Microsoft's update · Important

  • KB5126651 — Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation) · build 10.0.17763.9376 · restart required
  • KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
  • KB5126646 — Windows Server 2025 (Server Core installation), Windows Server 2025 · build 10.0.26100.33650 · restart required
  • KB5126868 — Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation) · build 10.0.14393.9612 · restart required
  • KB5126835 — Windows Server 2012, Windows Server 2012 (Server Core installation) · build 6.2.9200.26434 · restart required
  • KB5126836 — Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) · build 6.3.9600.23470 · restart required

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 7

  1. StatusAnalyzed → ModifiedNVD modified 2026-10-23 18:18
  2. Description
    Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over a network.Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over an adjacent network.
    NVD modified 2026-10-23 18:18
  3. CVSS9.8 (v3.1, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) → 8.8 (v3.1, CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)NVD modified 2026-10-23 18:18
  4. Cpes+10 CPE criteria (now 10)NVD modified 2026-10-21 15:34
  5. StatusPublished → AnalyzedNVD modified 2026-10-21 15:34
  6. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:33
  7. First seenCVSS 9.8NVD modified 2026-10-14 04:18

Affected (CPE criteria) 10

  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

References 1