CVE-2026-126904
Description
A flaw was found in the Compositing component of Chromium. A use-after-free memory corruption issue allows arbitrary code execution outside the browser sandbox. A remote attacker who has already compromised a browser renderer process could exploit this flaw by enticing a user to view a crafted HTML page, escaping sandbox protections to run unauthorized code on the host system.
Statement
This vulnerability is rated as Important severity because escaping the browser sandbox presents a direct threat to the integrity of the host operating system, even though exploitation requires an initial compromise of the rendering process. An attacker would need to trick a user into visiting a malicious webpage to trigger memory corruption within the compositing pipeline. If successfully exploited, the flaw bypasses containerization boundaries and allows execution of code with the permissions of the logged-in desktop user.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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