CVE-2026-17836 in Chrome
Summary
by MITRE • 07/30/2026
Use after free in V8 in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical use-after-free condition within the V8 JavaScript engine component of Google Chrome, affecting versions prior to 151.0.7922.72. The flaw occurs when the JavaScript engine fails to properly manage memory references after an object has been freed, creating a scenario where subsequent operations attempt to access memory that has already been deallocated. Such conditions are particularly dangerous in browser environments where JavaScript execution is prevalent and memory management directly impacts sandbox isolation boundaries.
The technical implementation of this vulnerability stems from improper reference counting or garbage collection mechanisms within V8's memory management system. When certain JavaScript objects are processed in specific sequences, the engine may release memory associated with these objects while still maintaining references to them. This creates a race condition where an attacker can manipulate the execution flow to trigger the use-after-free scenario through carefully crafted HTML content that exercises particular JavaScript operations.
The operational impact of this vulnerability extends beyond typical memory corruption exploits due to its location within the browser's sandboxed JavaScript environment. Attackers can leverage this flaw to bypass security boundaries and execute arbitrary code with the privileges of the sandboxed process, potentially leading to full system compromise. The medium severity classification by Chromium reflects the complexity required to achieve exploitation, though the potential for remote code execution makes this a significant threat vector in modern web browsing environments.
This vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in software systems, and demonstrates how improper memory management can create persistent security weaknesses. The attack surface is particularly concerning as it operates within the browser's JavaScript engine where attackers can construct malicious pages that trigger the vulnerable code path through legitimate web content execution. The sandbox escape capability indicates a failure in Chrome's security model where memory corruption can be leveraged to break out of restricted execution environments.
Mitigation strategies focus primarily on immediate software updates to versions containing patched V8 implementations, as well as implementing additional runtime protections such as address space layout randomization and stack canaries. Organizations should prioritize patch management processes to ensure rapid deployment of these security updates across all affected browser installations. The vulnerability also underscores the importance of continuous security testing and code review practices for JavaScript engines, particularly in high-risk environments where sandboxed execution is critical for system security.