CVE-2026-106283 in Chrome
Summary
by MITRE • 10/06/2026
Use after free in Streaming in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as a use-after-free error within Google Chrome's streaming module prior to version 155.0.8059.39 represents a critical memory management flaw that compromises the integrity of the browser's sandboxing mechanisms. This specific class of defect occurs when the application continues to reference a memory block after it has been freed, leading to undefined behavior that can be exploited by malicious actors. In this context, the streaming functionality likely involves handling media or data streams where object lifecycles are managed dynamically. When an attacker crafts a specialized HTML page designed to trigger specific race conditions or state transitions within the streaming engine, they can manipulate the memory allocator such that freed objects are reused for new allocations without proper initialization checks. This allows the attacker to control the contents of the reclaimed memory space, effectively gaining arbitrary read and write capabilities within the context of the browser process.
The operational impact of this vulnerability is severe due to its potential for remote code execution inside the sandbox. Although Chrome employs a multi-process architecture with strict isolation between renderer processes and the system kernel, use-after-free vulnerabilities in core components like streaming can sometimes allow attackers to escape these boundaries or escalate privileges within the renderer itself. By leveraging social engineering techniques, such as tricking a user into visiting a malicious website containing the crafted HTML payload, an attacker can trigger the exploit chain. Once the vulnerability is triggered and memory corruption occurs, the attacker may achieve arbitrary code execution with the permissions of the browser process. This could lead to data exfiltration, installation of malware, or further lateral movement within a network if the user has elevated privileges on their host system. The Chromium security severity rating of Medium reflects that while exploitation requires user interaction and specific conditions, the underlying memory corruption is potent enough to bypass standard defenses under the right circumstances.
From a technical classification perspective, this vulnerability aligns with CWE-416, which defines use after free as referencing memory after it has been freed. This error often stems from improper pointer management or failure to nullify references after deallocation. In modern browsers, such flaws are particularly dangerous because they can be chained with other vulnerabilities like type confusion or out-of-bounds reads to build a reliable exploit chain that defeats sandboxing protections. The ATT&CK framework categorizes this activity under T1059, Command and Scripting Interpreter, as the ultimate goal is often to execute code on the target system. Furthermore, it falls under TA0004, Privilege Escalation if the sandbox escape leads to higher privileges, or TA0002, Execution if the focus remains within the browser process for malicious actions like keylogging or credential theft.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where these memory management issues have been addressed by developers through rigorous code reviews and automated fuzzing tests that detect such lifecycle errors before release. For organizations managing large deployments of browsers, implementing strict content security policies can help mitigate the risk of executing arbitrary scripts from untrusted sources. Additionally, enabling sandbox enforcement features ensures that even if a vulnerability is exploited, the damage is contained within isolated processes rather than affecting the entire operating system. Regular patch management and monitoring for unusual network activity originating from browser processes are also essential defensive measures to detect potential exploitation attempts in real-time.