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CVE-2026-20846 is a denial-of-service vulnerability in Microsoft Windows GDI+ caused by a buffer over-read. The flaw allows an unauthorized attacker to trigger out-of-bounds read behavior in the GDI+ component via network-delivered input, leading to abnormal process or service termination. Available information identifies the issue class and affected component, but does not provide the specific vulnerable function or parsing pathway.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability affecting Windows GDI+.
A vulnerability affecting Windows GDI+; specific impact type not provided in the content.
A denial of service vulnerability in Windows GDI+ (no additional details provided in the content).
A denial-of-service vulnerability in Windows GDI+.
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.