CVE-2026-40406

Home/CVE/Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.

CVE

Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.

HIGH · CVSS 7.5 EPSS 0.00085

Schedule remediation

SSVC automatable: yes - attacks can be scripted at scale
CVSS base score ≥ 7.0

Sigma rules0 YARA rules0

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Weakness Classification

CWE-416Use After Free

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Affected Products & Versions

microsoft windows 10 1607< 10.0.14393.9140
microsoft windows 10 1809< 10.0.17763.8755
microsoft windows 10 21h2< 10.0.19044.7291
microsoft windows 10 22h2< 10.0.19045.7291
microsoft windows 11 23h2< 10.0.22631.7079
microsoft windows 11 24h2< 10.0.26100.8390
microsoft windows 11 25h2< 10.0.26200.8390
microsoft windows 11 26h1< 10.0.28000.2113
Show all 14 affected productsmicrosoft windows server 2012all versions
microsoft windows server 2016< 10.0.14393.9140
microsoft windows server 2019< 10.0.17763.8755
microsoft windows server 2022< 10.0.20348.5074
microsoft windows server 2022 23h2< 10.0.25398.2330
microsoft windows server 2025< 10.0.26100.32772

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Scoring & Timeline

7.5

HIGH · CVSS v3.1 · secure@microsoft.com

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD12 May 2026 · 06:17 PM

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

SSVC triage · cisa-vulnrichment

Exploitation

none

Automatable

yes

Technical impact

partial

SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

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Vendor Advisories

msrcCVE-2026-40406Information Disclosure

Intelligence Graph · click any node to traverse

CVETechnique ActorTool Family

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External lookups - second-class, for what we don’t hold ourselves

NVD CVE.org CISA Vulners Exploit-DB GitHub PoC VulnCheck KEV GreyNoise

Vulnerabilities
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Detection & defense
Sigma rules
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Compliance
NIST 800-53
ISO 27001:2022
SOC 2 TSC
PCI-DSS v4.0
CIS Controls v8.1

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