CVE-2025-11458 is a heap buffer overflow vulnerability identified in the Sync component of Google Chrome prior to version 141.0.7390.65. The flaw allows a remote attacker to perform an out-of-bounds memory read by delivering a crafted HTML page that triggers the overflow during the synchronization process. This vulnerability is exploitable over the network without requiring any privileges but does require user interaction, specifically visiting a malicious web page. The vulnerability primarily compromises confidentiality and integrity by potentially leaking sensitive memory contents and enabling further exploitation. The CVSS v3.1 base score is 8.1, reflecting high severity due to the ease of exploitation (network vector, low attack complexity, no privileges required) and significant impact on confidentiality and integrity. There is no indication of availability impact. No known exploits have been reported in the wild as of the publication date. The vulnerability was publicly disclosed on November 6, 2025, with Google recommending immediate update to Chrome 141.0.7390.65 or later to remediate the issue. The lack of a patch link in the provided data suggests organizations should verify updates through official Google Chrome channels. The vulnerability affects all platforms running the vulnerable Chrome versions, making it broadly relevant. Given Chrome's widespread use in enterprise and consumer environments, the risk surface is extensive. The technical root cause is a heap buffer overflow in the Sync module, which likely results from improper bounds checking during memory operations related to synchronization data. This flaw can be leveraged to read out-of-bounds memory, potentially exposing sensitive data or enabling further exploitation chains.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of data accessed or synchronized via Google Chrome. Attackers can exploit this flaw remotely by tricking users into visiting malicious web pages, potentially leading to unauthorized disclosure of sensitive information or further compromise of user sessions. Organizations relying heavily on Chrome for accessing cloud services, webmail, or internal web applications are particularly vulnerable. The impact is heightened in sectors such as finance, healthcare, and government, where data confidentiality is paramount. Although no availability impact is noted, the breach of confidentiality and integrity can lead to regulatory non-compliance under GDPR, reputational damage, and financial losses. The absence of known exploits in the wild provides a window for proactive mitigation, but the high severity score and ease of exploitation necessitate urgent action. The vulnerability also increases the attack surface for advanced persistent threats targeting European critical infrastructure and enterprises.

1. Immediately update all Google Chrome installations to version 141.0.7390.65 or later, ensuring that automatic updates are enabled and functioning correctly. 2. Employ enterprise browser management tools to enforce update policies and monitor browser versions across the organization. 3. Restrict access to untrusted or suspicious websites through web filtering solutions and DNS filtering to reduce exposure to crafted malicious pages. 4. Enable Chrome security features such as site isolation, strict site permissions, and sandboxing to limit the impact of potential exploitation. 5. Educate users about the risks of visiting untrusted websites and phishing attacks that could lead to exploitation. 6. Monitor network and endpoint logs for unusual browser behavior or memory access patterns indicative of exploitation attempts. 7. Consider deploying endpoint detection and response (EDR) solutions capable of detecting anomalous memory reads or browser exploitation techniques. 8. Coordinate with IT and security teams to prioritize patch management and incident response readiness in case of emerging exploit activity.