CVE-2026-118327 in Chrome
Summary
by MITRE • 10/28/2026
Memory corruption in Media in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code inside 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 described represents a critical memory safety issue within the media processing subsystem of Google Chrome, specifically affecting versions prior to 156.0.8078.73. This flaw is classified as a high-severity memory corruption defect in Chromium, indicating that it involves improper handling of data structures or buffer boundaries during the decoding or rendering of multimedia content. Such vulnerabilities typically arise from errors like use-after-free conditions, heap buffer overflows, or integer overflows within the complex code paths responsible for parsing and processing media files. The presence of this flaw allows an attacker to manipulate memory states in a way that compromises the integrity of the application's execution environment, potentially leading to arbitrary code execution if exploited successfully.
From a technical perspective, memory corruption vulnerabilities are among the most dangerous classes of security flaws because they can bypass many traditional defense mechanisms when combined with other techniques like return-oriented programming or data-only attacks. In the context of Chrome’s architecture, which relies heavily on sandboxing to isolate web content from the host operating system, this vulnerability poses a significant risk if it enables an escape from that restricted environment. The media pipeline is particularly susceptible because it handles untrusted input from various sources and performs complex transformations in native code rather than managed environments like JavaScript. A crafted HTML page containing maliciously constructed media elements or embedded files can trigger the flawed logic within the renderer process, causing memory corruption that may allow an attacker to gain control over program flow.
The operational impact of this vulnerability is severe due to its potential for remote exploitation without user interaction beyond visiting a targeted webpage. An attacker could host a specially crafted HTML page designed to exploit the media processing flaw and lure users into accessing it via phishing campaigns, malicious advertisements, or compromised websites. If successful, the attack vector allows for arbitrary code execution within the context of the browser’s sandboxed renderer process. While Chrome’s multi-process architecture limits immediate system-wide compromise, achieving code execution in a privileged renderer can facilitate further attacks such as cross-site scripting persistence, credential theft through memory scraping, or serving as a stepping stone to escape the sandbox and achieve full system compromise depending on the specific exploit chain developed by threat actors.
This type of vulnerability aligns with Common Weakness Enumeration (CWE) categories such as CWE-120 Buffer Copy without Checking Size of Input Classic Buffer Overflow, CWE-416 Use After Free, or CWE-787 Out-of-bounds Write depending on the exact nature of the memory corruption. In terms of the MITRE ATT&CK framework, this falls under Tactic TA0005 Defense Evasion and specifically Technique T1203 Exploitation for Client Execution, as it leverages client-side software vulnerabilities to execute malicious code. The high severity rating from Chromium reflects the likelihood of exploitation in the wild and the potential impact on user security posture if left unpatched.
Mitigation strategies primarily involve applying the vendor-provided patch immediately upon availability. For organizations managing large fleets of Chrome browsers, automated update mechanisms should be verified to ensure that version 156.0.8078.73 or later is deployed across all endpoints. Additionally, security teams can implement network-level controls such as web filtering proxies to block access to known malicious domains hosting exploit kits. Endpoint detection and response solutions may also help identify suspicious behavior patterns associated with memory corruption exploits, such as unusual process spawning or attempts to inject code into browser processes. Regular vulnerability scanning and patch management cycles are essential to minimize the window of exposure for this class of high-severity client-side vulnerabilities.