CVE-2025-10891 is a high-severity integer overflow vulnerability identified in the V8 JavaScript engine used by Google Chrome versions prior to 140.0.7339.207. The vulnerability arises from improper handling of integer values within V8, which can lead to an integer overflow condition. This overflow can be exploited by a remote attacker who crafts a malicious HTML page containing specially designed JavaScript code. When a victim user visits this page using a vulnerable Chrome browser, the integer overflow can trigger heap corruption. Heap corruption may allow the attacker to execute arbitrary code within the context of the browser process, potentially leading to full compromise of the user's browsing session or system depending on sandboxing and privilege levels. The vulnerability requires user interaction, specifically visiting a malicious web page, and does not require any prior authentication. The CVSS v3.1 base score of 8.8 reflects the high impact on confidentiality, integrity, and availability, with network attack vector, low attack complexity, no privileges required, and user interaction needed. Although no known exploits in the wild have been reported at the time of publication, the nature of the vulnerability and its presence in a widely used browser component make it a significant threat. The lack of patch links suggests that users should update to version 140.0.7339.207 or later once available to mitigate this risk.

For European organizations, this vulnerability poses a substantial risk due to the widespread use of Google Chrome as a primary web browser across enterprises, government agencies, and critical infrastructure sectors. Exploitation could lead to unauthorized access to sensitive data, session hijacking, or deployment of malware within corporate networks. Given the high confidentiality, integrity, and availability impacts, successful exploitation could result in data breaches, disruption of business operations, and potential regulatory non-compliance under GDPR due to loss or exposure of personal data. The requirement for user interaction means that phishing or social engineering campaigns could be leveraged to increase exploitation likelihood. Additionally, sectors with high reliance on web-based applications, such as finance, healthcare, and public administration, may face elevated risks. The absence of known exploits in the wild currently provides a window for proactive patching and mitigation before widespread attacks occur.

European organizations should prioritize immediate patch management to update all Chrome installations to version 140.0.7339.207 or later as soon as patches are released. Until updates are applied, organizations should implement network-level protections such as web filtering to block access to untrusted or suspicious websites that could host malicious HTML content. Employing endpoint detection and response (EDR) solutions capable of identifying anomalous browser behavior or heap corruption attempts can provide early warning. User awareness training should emphasize caution when clicking on unknown links or visiting untrusted sites, reducing the risk of user interaction exploitation. Additionally, organizations should consider deploying browser isolation technologies or sandboxing to limit the impact of potential exploitation. Monitoring threat intelligence feeds for emerging exploit reports related to CVE-2025-10891 will enable timely response to evolving threats.