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CVE-2026-58289 is a critical remote code execution vulnerability in Microsoft Edge (Chromium-based) caused by access of a resource using an incompatible type, i.e., a type confusion condition. The flaw affects Edge versions prior to 150.0.4078.48. Successful exploitation allows an unauthorized attacker to execute code over a network. Publicly available information identifies the issue as a browser-engine memory safety flaw but does not provide the specific vulnerable function or code path.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Microsoft Edge (Chromium-based) with a CVSS score of 9.0 that could allow arbitrary code execution.
A critical type confusion remote code execution vulnerability in Microsoft Edge that allows unauthorized network-based code execution.
A critical 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.