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CVE-2026-12443 is a critical use-after-free vulnerability in the Web Authentication component of Google Chrome prior to version 149.0.7827.155. The flaw is triggered when Chrome processes attacker-controlled web content, leading to access to memory after it has been freed. This memory-safety error can corrupt browser process state and is reported as reachable via a crafted HTML page. In affected builds, successful exploitation could allow arbitrary code execution in the context of the targeted browser 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.
11 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's Web Authentication component that could allow arbitrary code execution in the browser context.
A critical Chrome vulnerability affecting Web Authentication, included among severe browser flaws that could contribute to serious exploitation chains.
A critical use-after-free vulnerability in Chrome Web Authentication.
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.