Use-after-free in WebShare in Google Chrome on Windows
CVE-2026-12437 is a critical use-after-free vulnerability in the WebShare component of Google Chrome on Windows prior to version 149.0.7827.155. The flaw is a memory-safety error in which an object in WebShare can be accessed after it has been freed, creating a condition for memory corruption. According to the provided advisory context, exploitation is possible via a crafted HTML page, but requires that the attacker has already compromised the renderer process. In that post-renderer-compromise state, the bug can be used to cross Chrome's security boundary and potentially escape the sandbox. The issue is also inherited by Chromium-based browsers that consumed the vulnerable upstream Chromium code, including Microsoft Edge until the corresponding fixed release.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
7 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 WebShare component that could allow arbitrary code execution in the browser context.
A critical Chrome vulnerability in the WebShare component, described in the context of memory-safety issues and likely use-after-free bugs that could enable remote code execution.
A critical use-after-free vulnerability in Chrome WebShare.
The version that knows your environment.
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.