Heap-based Buffer Overflow in Microsoft Graphics Component
CVE-2026-21246 is a heap-based buffer overflow in the Microsoft Graphics Component. The available advisory text states that the flaw allows an authorized attacker to elevate privileges locally. Based on the provided information, the vulnerability arises from improper handling of memory on the heap within the graphics component, leading to an out-of-bounds write condition that can be leveraged during local exploitation. No further technical details about the specific vulnerable function, code path, or triggering input are provided in the supplied content.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A privilege escalation vulnerability affecting the Windows Graphics Component.
An elevation of privilege vulnerability in Windows Graphics Component (no additional details provided in the content).
An elevation of privilege vulnerability in a Windows Graphics Component.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.