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CVE-2026-62735

Windows HTTP.sys Elevation of Privilege Vulnerability

Published: Aug 11, 2026Updated: Aug 16, 2026 Sources: CVE List NVDCWE-122
7.8HIGH
NVD MITRE
EPSS Score
0.4%
Top 68.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

In plain language

AI Act now

This is a Windows bug that can let someone with local access raise their privileges; if your business computers are up to date, the risk is much lower, but unpatched systems should be updated urgently.

Executive summary

CVE-2026-62735 is a local elevation of privilege issue in Windows HTTP.sys driven by a memory-safety weakness (heap-based buffer overflow, CWE-122/CWE-190), enabling an attacker with local access to gain higher privileges.

If affected, business impact
Full admin-level accessSystem compromiseService disruptionWorm-like spread unlikely

What to do now

  1. Check your Windows version/build number and whether Windows HTTP.sys has been patched by applying the latest Microsoft security updates for CVE-2026-62735.
  2. If you are on Windows 10, update to at least one of: 10.0.14393.9418, 10.0.17763.9115, 10.0.19044.7663, or 10.0.19045.7663.
  3. If you are on Windows 11, update to at least one of: 10.0.22631.7517, 10.0.26100.9106, 10.0.26200.9106, or 10.0.28000.2704.
  4. If you are on Windows Server, update to at least one of: 2012/2016 → 10.0.14393.9418 or 2019 → 10.0.17763.9115, 2022 → 10.0.20348.5440, 2025 → 10.0.26100.33222.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122CWE-190

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 version 23H2On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
and 25 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-62735?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62735
msrc.microsoft.com
News mentions
4

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