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CVE-2026-56645 is a heap-based buffer overflow vulnerability in Microsoft Edge (Chromium-based) that can lead to remote code execution. The flaw affects Edge versions prior to 150.0.4078.48. Available information identifies the bug class as a heap memory corruption issue but does not provide the specific vulnerable component or function. Successful exploitation allows an unauthorized attacker to trigger memory corruption in the browser and execute attacker-controlled code in the context of the affected Edge process.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer overflow remote code execution vulnerability in Microsoft Edge.
A high-severity remote code execution vulnerability affecting Microsoft Edge (Chromium-based).
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.