High

Windows Graphics Component RCE in Win32K GRFX

IdentifiersCVE-2026-44812CWE-190· Integer Overflow or Wraparound

CVE-2026-44812 is a critical remote code execution vulnerability in the Windows Graphics Component, specifically the Windows Win32K-GRFX subsystem. The flaw is caused by an integer overflow or wraparound condition. Microsoft states that an unauthorized attacker can achieve code execution locally when a user views a specially crafted file in the Windows File Explorer Preview Pane or opens the file directly. Although labeled as remote code execution, the attack is delivered via malicious content and executes on the local machine after user interaction. Microsoft assigned CVSS 3.1 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and assessed exploitation as more likely.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary code execution on the affected system in the context of the vulnerable component, with high impact to confidentiality, integrity, and availability. In practical terms, this can enable full compromise of the targeted workstation after the victim previews or opens a malicious file, including execution of attacker-controlled payloads and follow-on actions consistent with full system compromise.

Mitigation

If you can’t patch tonight, do this now.

No specific vendor mitigation was provided in the supplied content. In the absence of a patch, reduce exposure by preventing users from previewing or opening untrusted files, disabling or restricting use of the Windows File Explorer Preview Pane where operationally feasible, and enforcing controls that limit delivery and execution of attacker-supplied files from email, web downloads, and other untrusted sources. Standard hardening such as application control, attachment filtering, and least-privilege may reduce post-exploitation impact but does not remediate the underlying flaw.

Remediation

Patch, then assume compromise.

Apply the Microsoft security update for CVE-2026-44812. Microsoft indicates an official fix is available and customer action is required. For related affected Android Office applications—Microsoft Word for Android, Microsoft PowerPoint for Android, and Microsoft Excel for Android—security updates were not immediately available at publication; defenders should monitor Microsoft advisory revisions and deploy those updates as soon as released.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Microsoft CorporationExcelapplication

Microsoft CorporationPowerpointapplication

Microsoft CorporationWindowsoperating_system

Microsoft CorporationWordapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app

hackreadNews

Jun 10, 2026

Microsoft June 2026 Patch Tuesday Fixes 206 Flaws and 3 Zero-Days

A code execution vulnerability triggered when a user previews or opens a malicious file in Windows File Explorer or related file-handling contexts.

cyberthroneNews

Jun 10, 2026

Microsoft Patch Tuesday - June 2026 - TheCyberThrone

A critical local remote code execution vulnerability in the Windows Win32K GRFX graphics subsystem caused by integer overflow or wraparound.

malware newsNews

Jun 9, 2026

Microsoft Patch Tuesday for June 2026 - Snort rules and prominent vulnerabilities - Malware News - Malware Analysis, News and Indicators

A critical remote code execution vulnerability in the Windows Graphics component / Win32K-GRFX subsystem caused by integer overflow or wraparound.

dark readingNews

Jun 9, 2026

Blame AI: Patch Tuesday Hits Record 206 CVEs

A remote code execution vulnerability in the Windows Graphics Component described as a doorway to full system compromise.

+1 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-44812

NVD

nvd.nist.gov/vuln/detail/CVE-2026-44812

MITRE CWE · CWE-190

Integer Overflow or Wraparound

msrc.microsoft.com

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44812