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CVE-2026-50521 is a high-severity use-after-free vulnerability in Microsoft Edge (Chromium-based). The flaw can be triggered over the network and may allow code execution in the context of the affected browser process. Available reporting identifies the issue as a memory-safety error consistent with dereferencing or reusing freed memory, which can lead to memory corruption and attacker-controlled execution flow. The vulnerability affects Microsoft Edge releases prior to the patched versions identified by Microsoft, including builds before 149.0.4022.98.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free remote code execution vulnerability in Microsoft Edge allowing authenticated attackers to execute arbitrary code over the network.
A high-severity remote code execution vulnerability affecting Microsoft Edge (Chromium-based).
A remote code execution vulnerability in Microsoft Edge (Chromium-based) that could allow a remote attacker to execute arbitrary code over a network.
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.