CVE-2025-11206 is a heap buffer overflow vulnerability found in the video processing component of Google Chrome versions prior to 141.0.7390.54. The flaw arises when processing crafted HTML content that manipulates video elements, leading to an out-of-bounds write in the heap memory. This memory corruption can be exploited by a remote attacker to escape the browser's sandbox environment, which is designed to isolate web content and prevent unauthorized access to the underlying system. The vulnerability is remotely exploitable over the network without requiring authentication but does require user interaction, such as visiting a maliciously crafted webpage. The sandbox escape capability significantly elevates the threat, as it allows attackers to execute arbitrary code with higher privileges on the host system, potentially leading to data theft, system compromise, or further lateral movement within a network. The CVSS v3.1 base score of 7.1 reflects a high severity, considering the attack vector is network-based with low attack complexity, no privileges required, but user interaction is necessary. The scope is changed due to the sandbox escape, affecting components beyond the browser itself. No public exploits have been reported yet, but the vulnerability's characteristics make it a prime candidate for future exploitation. The vulnerability was publicly disclosed on November 6, 2025, and Google has released a patched version (141.0.7390.54) to remediate the issue.

For European organizations, this vulnerability poses a significant risk due to the widespread use of Google Chrome as a primary web browser. Successful exploitation could lead to unauthorized access to sensitive data, disruption of services, and potential compromise of internal networks if attackers leverage the sandbox escape to deploy malware or pivot laterally. Organizations in sectors such as finance, healthcare, government, and critical infrastructure are particularly at risk given their reliance on secure web browsing and the high value of their data. The ability to execute code outside the sandbox increases the likelihood of persistent infections and data breaches. Additionally, the requirement for user interaction means that phishing or social engineering campaigns could be used to lure victims to malicious sites. The impact extends to cloud-based environments and remote work setups common in Europe, where endpoint security is critical. Failure to promptly update Chrome could lead to increased exposure to targeted attacks or opportunistic exploitation by cybercriminals.

European organizations should immediately update all Google Chrome installations to version 141.0.7390.54 or later to remediate the vulnerability. Beyond patching, organizations should implement network-level protections such as web filtering to block access to known malicious sites and employ endpoint detection and response (EDR) solutions to monitor for suspicious browser behavior indicative of sandbox escape attempts. User awareness training should emphasize the risks of interacting with untrusted web content and the importance of cautious browsing habits. Deploying browser hardening techniques, such as disabling unnecessary plugins and enabling strict site isolation features, can reduce the attack surface. Organizations should also consider application whitelisting and sandboxing at the OS level to contain potential exploits. Regular vulnerability scanning and penetration testing can help identify unpatched systems. Finally, maintaining robust incident response plans will ensure rapid containment if exploitation occurs.