CVE-2025-6558 is a security vulnerability identified in Google Chrome versions prior to 138.0.7204.157. The issue arises from insufficient validation of untrusted input within the ANGLE (Almost Native Graphics Layer Engine) and GPU components of the browser. ANGLE is a graphics abstraction layer used by Chrome to translate OpenGL ES calls to other graphics APIs, and the GPU process handles rendering tasks isolated from the main browser process. The vulnerability allows a remote attacker to craft a malicious HTML page that exploits this insufficient input validation to potentially escape the browser's sandbox environment. A sandbox escape is a critical security concern because it allows malicious code running within the restricted browser context to break out and execute with higher privileges on the host system. This could lead to unauthorized access to system resources, data exfiltration, or further compromise of the underlying operating system. Although no known exploits are currently reported in the wild, the nature of the vulnerability—affecting core browser components responsible for graphics rendering and sandboxing—makes it a high-risk issue. The lack of a CVSS score means severity must be assessed based on the impact on confidentiality, integrity, and availability, the ease of exploitation (remote via crafted HTML), and the scope of affected systems (all users running vulnerable Chrome versions). Given Chrome's widespread use, this vulnerability has a broad attack surface. The vulnerability was published on July 15, 2025, and affects Chrome versions before 138.0.7204.157, indicating that updating to or beyond this version addresses the issue.

For European organizations, the impact of CVE-2025-6558 could be significant due to the widespread use of Google Chrome as a primary web browser in corporate and public sectors. A successful sandbox escape could allow attackers to bypass browser security restrictions, leading to potential execution of arbitrary code on user machines. This could result in data breaches, unauthorized access to sensitive information, lateral movement within corporate networks, and disruption of business operations. Given the browser's role as a gateway to web applications and cloud services, exploitation could facilitate further attacks on internal systems or compromise user credentials. The vulnerability's exploitation does not require user authentication but does require user interaction in the form of visiting a maliciously crafted webpage, which is a common attack vector through phishing or malicious advertising. European organizations that rely heavily on web-based applications and have employees with elevated privileges on their devices are particularly at risk. Additionally, regulatory frameworks such as GDPR impose strict requirements on data protection, and a breach resulting from this vulnerability could lead to significant legal and financial consequences.

To mitigate the risk posed by CVE-2025-6558, European organizations should: 1) Immediately update all Google Chrome installations to version 138.0.7204.157 or later, where the vulnerability is patched. 2) Implement strict web filtering and URL reputation services to block access to known malicious sites and reduce the risk of users encountering crafted HTML pages designed to exploit this vulnerability. 3) Employ endpoint detection and response (EDR) solutions capable of monitoring unusual GPU or browser process behavior indicative of sandbox escape attempts. 4) Educate users on phishing awareness and the risks of visiting untrusted websites or clicking on suspicious links. 5) Utilize browser security features such as site isolation and disable unnecessary browser extensions that could increase the attack surface. 6) Consider deploying application control policies that restrict execution of unauthorized code and sandboxing technologies at the OS level to contain potential breaches. 7) Maintain an inventory of browser versions in use across the organization to ensure timely patch management and compliance.