Description

Use after free in HTML in Google Chrome prior to 151.0.7922.109 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-06T22:16:56.537Z",
  "pubdate": "2026-08-06T22:16:56.537Z",
  "executiveSummary": "A critical security flaw involving a Use-After-Free (UAF) condition exists within the HTML parsing component of Google Chrome prior to version 151.0.7922.109. This memory management vulnerability allows a remote attacker to achieve heap corruption by inducing the browser to interact with previously freed memory structures through a maliciously crafted HTML page. The vulnerability presents significant risk implications, potentially leading to arbitrary code execution within the context of the rendering process, which could compromise the integrity and confidentiality of the underlying host system. Exploitation requires user interaction, specifically convincing a target to navigate to and render a specially crafted web page controlled by the attacker via a remote network vector. The severity of this issue is classified as High by the Chromium security team, necessitating immediate patching and remediation actions to safeguard users against potential browser-compromise scenarios.",
  "technicalDetails": "The vulnerability is a classic Use-After-Free (UAF) condition localized within the HTML processing and DOM rendering engine of Google Chrome. A UAF vulnerability arises when a program continues to use a pointer after the memory region it references has been deallocated or freed. In this specific scenario, the flaw stems from improper lifecycle management of HTML objects during parsing and DOM tree manipulation.\nThe attack flow initiates when a remote attacker hosts a crafted HTML page containing malicious markup designed to trigger specific object allocation and deallocation sequences within the browser's heap. When an unsuspecting user loads this page over a network vector using an affected version of Google Chrome prior to 151.0.7922.109, the rendering engine processes the HTML elements. Due to the flaw in the object reference lifecycle, a dangling pointer is created, retaining a reference to a heap memory address that has already been released.\nSubsequent execution paths within the browser engine attempt to access the memory location referenced by the dangling pointer. Because the attacker can strategically manipulate heap layouts using heap grooming or spraying techniques via JavaScript and DOM operations, the previously freed memory can be re-allocated with attacker-controlled data. When the application dereferences the pointer, it processes the attacker-controlled payload as legitimate object data, resulting in heap corruption.\nThe exploitation of this heap corruption vulnerability can allow the remote attacker to manipulate internal control structures, potentially achieving arbitrary code execution within the security sandbox of the affected renderer process. The vulnerability requires no prior authentication or elevated privileges beyond the ability to deliver a crafted web page to the victim, though successful exploitation relies heavily on bypassing modern heap mitigation techniques and browser sandboxing mechanisms."
}