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Vulnerabilities/CVE-2026-50420Public Intelligence Dossier
Source: microsoft · Limited verification•Last verified: •Collection Running
CVE-2026-50420Unknown / EvaluatingMEDIUM (raw)CVSS 6.2CWE-125

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information locally.

Published: 14 Jul 2026•Last updated: 15 Oct 2026, 03:40 AM IST•Source identifier: secure@microsoft.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
6.2MEDIUM (raw)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Metric sourcesecure@microsoft.com
EPSS probability
0.4%0.004
Percentile34th
Weakness type
CWE-125
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information locally.

SOC priority

Medium

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

4 source-backed products
Affected products and versions (source)
  • microsoft windows 11 24h2 · < 10.0.26100.8875 · NVD CPE · Source
  • microsoft windows 11 25h2 · < 10.0.26200.8875 · NVD CPE · Source
  • microsoft windows 11 26h1 · < 10.0.28000.2269; < 10.0.28000.2525 · NVD CPE · Source
  • microsoft windows server 2025 · < 10.0.26100.33158 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched microsoft-enterprise (Affected product: microsoft windows 11 24h2, Vendor: microsoft)

Exposure

  1. Identify affected Microsoft products and compare local builds with the MSRC advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · The MSRC product/build mapping establishes applicability. · Rule microsoft-enterprise

Exploitation evidence

  1. Review the advisory's documented behavior on matching hosts before selecting a hunt.Telemetry: DeviceProcessEvents · Product family alone does not justify a CVE-specific detection. · Rule microsoft-enterprise

Response

  1. Confirm the source-stated KB or mitigation on matching assets.Telemetry: DeviceTvmSoftwareVulnerabilities · A post-update inventory check verifies remediation. · Rule microsoft-enterprise

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secure@microsoft.com
Record status · verification
UPDATED · Microsoft primary source linked
CPE
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:*:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*, cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Evidence & Provenance

2 public sources
msrc.microsoft.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-50420
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-50420
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-50420"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.