CVE-2026-106252 in Chrome
Summary
by MITRE • 10/06/2026
Incorrect comparison in Fonts in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect comparison within the font handling subsystem of Google Chrome prior to version 155.0.8059.39 represents a critical logic flaw in how the browser processes typeface data during rendering operations. This issue stems from a failure to properly validate or compare specific attributes associated with font files, which are essential components for web page layout and visual presentation. When a user visits a maliciously crafted HTML page containing specially constructed font resources, the browser's engine fails to correctly assess the integrity or boundaries of these assets. Instead of rejecting malformed data or handling it safely within isolated memory structures, the flawed comparison logic allows the processing pipeline to proceed with invalid assumptions about the font structure. This deviation from expected behavior creates a pathway for an attacker to manipulate how the browser interprets and renders text, potentially leading to unintended side effects in memory management routines that underpin the rendering engine.
From a technical perspective, this flaw falls squarely within the category of CWE-697, which describes incorrect comparison, often referred to as logic errors or race conditions depending on the specific trigger mechanism. In the context of browser engines like Blink, font parsing is a complex process involving multiple layers of abstraction and memory allocation. When an attacker crafts HTML that exploits this miscomparison, they can potentially cause the engine to access memory regions outside its intended boundaries or execute code paths that were not designed for such inputs. Although the Chromium security team has classified this vulnerability with a Low severity rating, indicating that exploitation may require specific conditions or limited impact in many scenarios, the underlying mechanism remains dangerous. The ability to influence internal state through font processing can be leveraged as part of a larger attack chain, particularly when combined with other vulnerabilities or sophisticated scripting techniques designed to bypass security controls.
The operational impact of this vulnerability is primarily centered on the potential for arbitrary code execution within the browser's sandboxed environment. Modern browsers rely heavily on process isolation and sandboxes to contain malicious content and prevent it from affecting the host operating system. However, if an attacker can trigger a logic error in font handling that leads to memory corruption or control flow hijacking, they may escape these restrictions. Successful exploitation would allow a remote attacker to execute arbitrary code with the privileges of the browser process. This could lead to data theft, installation of malware, or further lateral movement within a network if the victim is part of an enterprise environment. The risk is exacerbated by the ubiquity of web browsing and the fact that font rendering occurs automatically during page load, requiring no user interaction beyond visiting the malicious site.
To mitigate this risk, users must ensure they are running Google Chrome version 155.0.8059.39 or later, where these logic errors in the font subsystem have been corrected through rigorous code review and patching. Organizations should enforce automated update policies to minimize exposure windows for such vulnerabilities. Additionally, security teams can implement browser hardening techniques, such as disabling unnecessary plugins that might interact with rendering engines in unexpected ways, although this specific flaw is intrinsic to the core engine rather than an extension. Monitoring network traffic for unusual requests related to font resources or suspicious HTML structures containing embedded typefaces may also provide early indicators of exploitation attempts. It is crucial to recognize that while individual vulnerabilities like this one are rated low severity, they contribute to the overall attack surface and should be addressed promptly as part of a comprehensive vulnerability management strategy aligned with industry standards such as MITRE ATT&CK techniques related to initial access and execution via web browsers.