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Memory corruption

Heap-based buffer overflow in Windows Shell allows an unauthorized attacker to execute code over a network

CVE-2026-83782

What this means

This is rated critical severity (9.8 out of 10). There is no confirmed exploitation of it yet. Ask IT whether Microsoft Windows 10 1607, Microsoft Windows 10 1809 and Microsoft Windows 10 21h2, and 11 more are in your estate, and treat that as the priority.

Full vendor description

Heap-based buffer overflow in Windows Shell allows an unauthorized attacker to execute code over a network.

Scoring and exploitation

9.8/ 10
CVSS 3.1 base scoreCritical

Exploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.

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

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityLowAC:L
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeUnchangedS:U

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
~1% estimated chance of attack in 30 daysModel estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Not confirmed in the
Not reported

Weaknesses

CWE-122

Affected products ()

  • Microsoft Windows 10 1607
  • Microsoft Windows 10 1809
  • Microsoft Windows 10 21h2
  • Microsoft Windows 10 22h2
  • Microsoft Windows 11 23h2
  • Microsoft Windows 11 24h2
  • Microsoft Windows 11 25h2
  • Microsoft Windows 11 26h1
  • Microsoft Windows 11 26h2
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2025
Show the raw CPE strings (26)
  • 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_10_21h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*
  • cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*
  • 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:*:*:*:*:*:*:*:*

Showing 25 of 26 matches from .

References

1 link from the CVE record, grouped by site; the vendor's advisory comes first.

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