CVE-2026-106399 in Chrome
Summary
by MITRE • 10/07/2026
Out of bounds read in Skia in Google Chrome prior to 155.0.8059.39 allowed a local attacker leveraging social engineering to potentially read memory via a crafted file. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an out-of-bounds read within the Skia graphics library, which serves as the core rendering engine for Google Chrome prior to version 155.0.8059.39, represents a memory safety flaw with significant implications for data confidentiality. This issue arises when the application processes specially crafted input files that trigger an incorrect boundary check or pointer arithmetic operation within the Skia subsystem. Instead of properly validating the size of the requested read against the allocated buffer limits, the engine proceeds to access memory locations beyond the intended array or object boundaries. Because this is a read-only violation rather than a write exploit, it does not allow for arbitrary code execution but creates a direct pathway for information disclosure. The severity rating from Chromium as Low reflects that while the technical flaw exists, its exploitation requires specific conditions and yields limited immediate impact compared to remote code execution vulnerabilities.
The operational mechanism of this vulnerability relies heavily on social engineering tactics due to the local nature of the attack vector. An attacker cannot remotely trigger this condition over a network; instead, they must convince a user to open or render a maliciously constructed file within Chrome. This could involve distributing a crafted image, PDF, or other media format that exploits the parsing logic in Skia. When the victim interacts with the content, the browser attempts to decode and render it using the vulnerable version of Skia. The out-of-bounds read occurs during this rendering process, allowing the attacker to extract sensitive data from adjacent memory regions. This could potentially include cookies, session tokens, passwords stored in memory, or other private user information that resides near the targeted buffer. The success of such an attack is contingent upon the victim's willingness to engage with untrusted content, making it a classic example of how client-side rendering engines can be abused through deceptive file delivery mechanisms.
From a classification perspective, this vulnerability aligns closely with CWE-125, which describes Out-of-bounds Read vulnerabilities where software reads data past the end or before the beginning of the intended buffer. It also relates to CWE-200, an Information Exposure issue, as the primary consequence is the leakage of internal system information rather than a compromise of integrity or availability. In terms of adversary behavior, this aligns with ATT&CK technique T1567, specifically Exfiltration Over Web Service if the attacker uses Chrome's network capabilities to send stolen data out, although the initial access vector here is more aligned with local exploitation via social engineering rather than direct remote command and control. The low severity rating indicates that while the potential for data theft exists, the complexity of setup and reliance on user interaction limits its widespread automated exploitability compared to higher-severity flaws like use-after-free or buffer overflows leading to code execution.
Mitigation strategies primarily focus on timely software updates and defensive browsing practices. Users must upgrade Google Chrome to version 155.0.8059.39 or later, where the boundary checks in Skia have been corrected to prevent access beyond allocated memory limits. For organizations managing large fleets of devices, deploying automated patch management systems is critical to ensure that all endpoints are updated promptly after such security releases become available. Additionally, users should be educated on the risks of opening files from untrusted sources, particularly those designed to render graphics or media content within web browsers. Implementing strict Content Security Policies and disabling unnecessary browser features can further reduce the attack surface by limiting what types of local resources Chrome is permitted to process. Regular security audits and monitoring for unusual memory access patterns in development environments can also help identify similar flaws before they reach production releases, ensuring that the integrity of user data remains protected against such information disclosure threats.