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CVE-2026-70354 is an out-of-bounds write vulnerability in .NET Windows Presentation Foundation (WPF) parsing and rendering logic. Insufficient validation of size constraints and unchecked integer arithmetic in native buffer-allocation calculations can cause an allocation-size multiplication to wrap. When subsequent parsing or rendering operations use the original attacker-controlled count or dimensions, WPF can write beyond the undersized heap allocation. Affected inputs may include complex graphical paths, font-table data, and XPS content. Heap corruption may enable local arbitrary code execution.
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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.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An out-of-bounds write in .NET enabling local code execution by an unauthorized attacker.
An out-of-bounds write flaw in .NET that enables unauthorized local code execution. The plugin's CVSS v3 base score is 7.8.
An out-of-bounds write vulnerability in .NET that permits an unauthorized attacker to execute code locally.
An out-of-bounds write vulnerability in Microsoft .NET that permits an unauthorized attacker to execute code locally.
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.