CVE-2026-118340 in Chrome
Summary
by MITRE • 10/28/2026
Memory corruption in Skia in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/28/2026
The vulnerability identified within the Skia graphics library, which serves as the core rendering engine for Google Chrome prior to version 156.0.8078.73, represents a critical memory corruption flaw that undermines the browser's primary defense mechanism. This issue arises from improper handling of data structures during the processing of graphical elements within crafted HTML pages. When an attacker constructs a malicious webpage containing specifically engineered graphics commands or image assets, they can trigger conditions where Skia fails to properly validate buffer boundaries or object lifecycles. This failure results in memory being written beyond its allocated limits or accessed after it has been freed, creating opportunities for arbitrary code execution. The severity of this flaw is classified as high by the Chromium security team because it directly impacts the integrity and confidentiality of user data by bypassing the sandbox environment that isolates web content from the underlying operating system.
From a technical perspective, memory corruption vulnerabilities in rendering engines are particularly dangerous due to their complexity and prevalence in handling untrusted input. In this specific instance, the flaw likely involves heap-based buffer overflow or use-after-free conditions within Skia's internal data structures. These types of errors allow an attacker to manipulate pointers in memory, potentially overwriting function return addresses or object vtables with malicious shellcode. By exploiting these weaknesses through a crafted HTML page, the attacker can achieve arbitrary code execution outside the restrictive sandbox boundaries that Chrome employs to limit the damage caused by compromised web pages. This bypass is significant because it elevates privileges from a low-privilege context within the browser process to a higher-level system access, effectively neutralizing one of the most important security features in modern web browsers.
The operational impact of this vulnerability extends beyond simple code execution. An attacker who successfully exploits this flaw can install programs, view, change, or delete data on the victim's machine, and create new accounts with full user rights. This level of access compromises not only the individual browser session but potentially the entire host system if additional exploitation techniques are employed to escalate privileges further. The risk is exacerbated by the fact that such vulnerabilities often remain undetected until a sophisticated attack campaign targets them, making proactive mitigation essential. Users relying on older versions of Chrome for legacy application support or specific enterprise configurations face heightened exposure unless they have implemented strict update policies or network-level filtering to block access to untrusted web content.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 156.0.8078.73 or later immediately upon availability. This patch includes the necessary fixes within the Skia library to correct the memory handling errors that lead to corruption. In environments where immediate patching is not feasible, implementing application whitelisting can prevent unauthorized code execution even if the vulnerability is exploited. Additionally, deploying network intrusion detection systems configured with signatures for known exploitation attempts related to browser rendering engines can provide an additional layer of defense. Regular security audits and penetration testing focused on web-based attack vectors are also recommended to identify similar weaknesses in custom applications or third-party plugins that may rely on similar graphics processing libraries.
This vulnerability aligns with Common Weakness Enumeration (CWE) categories such as CWE-120, Buffer Copy without Checking Size of Input Classic Buffer Overflow, and CWE-416, Use After Free. These classifications highlight the fundamental programming errors that allow attackers to manipulate memory state in unintended ways. Furthermore, from a tactical standpoint relevant to threat intelligence frameworks like MITRE ATT&CK, this exploit falls under techniques associated with Initial Access via Spearphishing Link or Drive-by Compromise, specifically leveraging browser vulnerabilities for code execution. Understanding these mappings helps security teams prioritize remediation efforts and develop more robust detection rules based on behavioral indicators of such memory corruption exploits in real-time monitoring systems.