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CVE-2026-12011 is a critical use-after-free vulnerability in the WebMIDI component of Google Chrome on Windows prior to version 149.0.7827.115. The flaw is triggered during handling of WebMIDI-related objects, leading to memory corruption after an object has been freed and subsequently reused. According to vendor reporting, exploitation requires a remote attacker to first compromise the renderer process and then use a crafted HTML page to potentially escape Chrome’s sandbox. The issue affects Chromium-based browsers that incorporate the vulnerable Chromium codebase until they receive the corresponding upstream fix.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical use-after-free vulnerability in Chrome WebMIDI that can lead to memory corruption and potentially arbitrary code execution via a specially crafted web page.
A critical use-after-free vulnerability in the Chrome WebMIDI component that could potentially allow attackers to execute arbitrary code or gain control over affected systems.
A critical use-after-free vulnerability in Chrome WebMIDI.
A critical use-after-free vulnerability in Chrome WebMIDI.
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.