Description

Uninitialized Use in Skia in Google Chrome prior to 151.0.7922.109 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "3.1",
  "pubDate": "2026-08-06T22:16:58.457Z",
  "pubdate": "2026-08-06T22:16:58.457Z",
  "executiveSummary": "An uninitialized use vulnerability exists within the Skia graphics library in Google Chrome prior to version 151.0.7922.109. This security flaw permits a remote attacker who has already compromised the renderer process to extract and leak cross-origin data through a specially crafted HTML page. Assigned a high severity rating by the Chromium security team, this vulnerability poses significant risks to user privacy and browser isolation boundaries. The primary impact is the unauthorized disclosure of sensitive cross-origin information, which could be leveraged in chained exploits. Successful exploitation requires the attacker to have prior execution control over the renderer process, typically achieved by exploiting an initial remote code execution or memory corruption vulnerability within the sandboxed browsing context. The attack vector relies on malicious web content processed by the affected Skia component, resulting in the unauthorized extraction of memory contents containing cross-origin data.",
  "technicalDetails": "The vulnerability resides in the Skia graphics processing component used within Google Chrome prior to version 151.0.7922.109. The root cause stems from the improper handling of uninitialized memory structures during specific rendering operations. In scenarios where memory is allocated but not properly zeroed or initialized prior to use, uninitialized buffer states can be read and processed by downstream rendering pipelines.\nExploitation of this vulnerability requires that a remote attacker has already achieved compromise of the renderer process. Because modern browsers employ rigorous sandboxing, compromising the renderer is generally the first phase of a multi-stage attack. Once execution within the renderer is established, the attacker deploys a crafted HTML page containing specific cascading style sheets, Scalable Vector Graphics, or canvas operations designed to trigger the uninitialized read within the Skia graphics engine.\nThe attack flow proceeds as follows: First, the attacker lures the victim to a malicious web page or leverages an existing renderer-level vulnerability to execute code within the context of the renderer process. Second, the crafted HTML page initiates rendering sequences that force the Skia component to interact with uninitialized memory regions. Third, because the memory contains remnants of previous allocations—potentially holding cross-origin data, document objects, or sensitive DOM structures—the Skia library processes and incorporates these uninitialized bytes into the rendering output.\nFinally, through side-channel techniques, timing attacks, or read-back mechanisms exposed via HTML5 canvas APIs, the attacker extracts the leaked data from the rendering artifacts, bypassing same-origin policy enforcement mechanisms at the memory layer. The post-exploitation impact is characterized by the unauthorized exposure of cross-origin information, enabling attackers to harvest sensitive user data, session artifacts, or internal application states processed within other browser tabs or frames."
}