CVE-2026-119261 in Chrome
Summary
by MITRE • 10/30/2026
Improper input validation in Skia in Google Chrome prior to 156.0.8078.79 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 • 10/30/2026
The vulnerability identified as an improper input validation flaw within the Skia graphics library, which serves as the core rendering engine for Google Chrome prior to version 156.0.8078.79, represents a significant risk to browser integrity and user security. This specific defect arises from insufficient sanitization or boundary checking of data inputs processed by the image processing components of Skia. When an attacker crafts a malicious HTML page containing specially constructed media assets or script-driven graphical elements, they can exploit this lack of validation to trigger memory corruption errors such as buffer overflows or use-after-free conditions within the browser's rendering pipeline. The severity is classified as High because it allows for code execution outside the restrictive sandbox environment that typically isolates web content from the underlying operating system and user data.
From a technical perspective, Skia handles complex operations including rasterization, font rendering, and image decoding. When these components receive malformed input, such as images with incorrect dimensions or corrupted headers, the application may allocate insufficient memory buffers or fail to properly manage pointer references. This discrepancy enables an attacker to write arbitrary data into adjacent memory regions, potentially overwriting function pointers or return addresses on the stack. By carefully crafting the payload, a remote adversary can achieve control flow hijacking, leading to the execution of arbitrary code with the privileges of the compromised browser process. Although Chrome employs multiple layers of defense including DEP and ASLR, successful exploitation of this vulnerability allows attackers to bypass these protections through sophisticated techniques like ROP chains or heap spraying, ultimately escaping the sandbox isolation that is critical for preventing full system compromise.
The operational impact of this vulnerability extends beyond simple page crashes or denial of service scenarios. Successful exploitation grants a remote attacker the ability to execute arbitrary commands on the victim's machine, facilitating data exfiltration, installation of persistent malware, or use of the compromised browser as a pivot point for further network attacks. This aligns with common attack patterns observed in real-world campaigns where drive-by downloads and exploit kits target outdated browsers to gain initial access. The ability to execute code outside the sandbox is particularly dangerous because it elevates the threat from local privilege escalation within the user context to potential system-level compromise, depending on how subsequent payloads are deployed by the attacker.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 156.0.8078.79 or later immediately upon availability. This update contains patches for the underlying Skia library that enforce stricter input validation rules and improve memory safety checks during image processing operations. Additionally, security administrators should consider implementing browser hardening policies such as disabling JavaScript in untrusted zones where feasible, utilizing content security policies to restrict resource loading sources, and deploying endpoint detection and response solutions capable of identifying suspicious process creation patterns indicative of sandbox escape attempts. Regular patch management cycles are essential to address such vulnerabilities before they can be widely exploited by threat actors leveraging automated exploit frameworks.
This vulnerability is categorized under CWE-20 Improper Input Validation in the Common Weakness Enumeration standard, reflecting its root cause as a failure to correctly validate or sanitize user-supplied data before processing. In terms of tactical behavior, it maps to ATT&CK technique T1203 Exploitation for Client Execution and potentially T1059 Command and Scripting Interpreter if subsequent payload delivery occurs via the browser environment. Understanding these mappings helps security teams prioritize remediation efforts based on both technical severity and strategic threat landscape analysis, ensuring that critical infrastructure remains protected against evolving web-based attack vectors.