Description

Race condition in V8 in Google Chrome prior to 151.0.7922.173 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-20T21:17:10.167Z",
  "pubdate": "2026-08-20T21:17:10.167Z",
  "executiveSummary": "A race condition vulnerability exists within the V8 JavaScript engine of Google Chrome prior to version 151.0.7922.173, classified as a high-severity memory management flaw. This security defect allows a remote attacker to achieve arbitrary code execution inside the security sandbox.\nThe vulnerability is triggered when a user processes a maliciously crafted HTML page via the vulnerable browser instance. Successful exploitation compromises the integrity of the rendering process, enabling malicious operations to occur within the restricted execution context of the sandbox.\nThe primary risk implication involves sandbox boundary degradation or secondary exploitation vectors leading to potential system compromise, provided additional vulnerabilities are leveraged to escape the sandbox environment. The attack vector requires network access through standard web browsing interactions, relying on victim participation by visiting a hostile web resource without requiring prior authentication or elevated privileges.",
  "technicalDetails": "The root cause of the vulnerability stems from a race condition vulnerability within the memory management and concurrency handling mechanisms of the V8 JavaScript engine. In multi-threaded or asynchronous execution contexts within the browser engine, improper synchronization or lock contention during object lifecycle management can lead to race conditions such as use-after-free or memory corruption states.\nThe vulnerable component is the V8 engine integrated within Google Chrome, specifically affecting software versions prior to 151.0.7922.173. The network exposure is remote, requiring the victim to navigate to a crafted HTML page containing malicious JavaScript or trigger conditions designed to exploit the synchronization flaw.\nThe attack flow proceeds as follows: First, the remote attacker deploys a crafted HTML page embedding specific asynchronous scripts or object manipulation routines designed to trigger concurrent operations within V8. Second, the victim renders the malicious web page using an affected version of Google Chrome. Third, the crafted script exploits the race condition by interleaving operations on shared memory resources or objects, causing a synchronization failure.\nThis synchronization failure results in memory corruption within the V8 heap. Fourth, the attacker leverages this memory corruption state to achieve arbitrary code execution constrained within the browser's security sandbox environment. The payload executes instructions under the privileges of the sandboxed renderer process, utilizing the compromised engine state for further malicious tasks."
}