Use-after-free RCE in Google Chrome Prerender
CVE-2026-6299 is a critical use-after-free vulnerability in Google Chrome's Prerender component affecting versions prior to 147.0.7727.101. The flaw is a lifetime-management bug in the prerender cancellation path: when a prerendered new-tab WebContents is canceled, synchronous destruction of the associated PrerenderNewTabHandle/WebContents can occur while BrowsingDataRemoverImpl is iterating over a snapshot of live WebContents raw pointers. This leaves a dangling pointer that can later be dereferenced, creating a use-after-free condition. The vulnerable path can be triggered during prerender cancellation, including via BrowsingDataRemoverImpl::RemoveImpl, and the provided context specifically notes that a Clear-Site-Data HTTP header can trigger that removal flow. Because Chrome prerenders pages in a hidden background tab, attacker-controlled content may begin executing before the user explicitly clicks the destination. Successful exploitation allows a remote attacker to achieve arbitrary code execution via a crafted HTML page.
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
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A critical use-after-free vulnerability in Chrome's Prerender function that could enable arbitrary code execution.
A critical use-after-free vulnerability in the Prerender component of Google Chrome that allows remote code execution via a crafted HTML page.
A critical use-after-free vulnerability in Prerender in Google Chrome.
A critical use-after-free remote code execution vulnerability in Google Chrome's Prerender feature caused by synchronous destruction of a live WebContents during prerender cancellation.
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Cross-references every affected SKU, including bundled OEM variants.
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