CVE-2026-4679 in Chrome
Summary
by MITRE • 03/24/2026
Integer overflow in Fonts in Google Chrome prior to 146.0.7680.165 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 03/28/2026
The vulnerability identified as CVE-2026-4679 represents a critical integer overflow flaw within Google Chrome's font handling subsystem that existed prior to version 146.0.7680.165. This issue falls under the Common Weakness Enumeration category CWE-190, which specifically addresses integer overflow conditions that can lead to memory corruption. The flaw manifests when Chrome processes font data within HTML pages, creating a scenario where an attacker can manipulate integer values in a way that exceeds the maximum representable value for the data type, subsequently causing unpredictable behavior in memory allocation and access patterns.
The technical exploitation of this vulnerability occurs through a crafted HTML page that contains malicious font data designed to trigger the integer overflow condition. When Chrome attempts to process this malformed font information, the overflow causes calculations to wrap around to unexpected values, leading to an out-of-bounds memory write operation. This memory corruption can occur in various font-related data structures including but not limited to glyph metrics, font table sizes, or character mapping arrays. The attacker can leverage this condition to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability.
From an operational perspective, this vulnerability presents a high-severity risk to users of affected Chrome versions as it enables remote code execution through web-based attacks. The attack vector requires no user interaction beyond visiting a malicious webpage, making it particularly dangerous in phishing campaigns or compromised websites. The vulnerability's exploitation potential aligns with ATT&CK technique T1059.001 for command and control through web-based payloads, and T1068 for privilege escalation through memory corruption. Organizations running affected Chrome versions face significant exposure since the flaw can be exploited through standard web browsing activities without requiring specialized attack tools or user consent.
The remediation approach for CVE-2026-4679 involves immediate upgrade to Google Chrome version 146.0.7680.165 or later, which contains the necessary patches to address the integer overflow condition in font processing. Security teams should implement comprehensive patch management protocols to ensure all endpoints are updated promptly, as this vulnerability affects a core browser component with widespread usage. Additionally, network administrators can deploy web application firewalls and content filtering solutions to block access to known malicious domains that may host exploit code for this vulnerability. The fix typically involves input validation and bounds checking mechanisms that prevent integer overflow conditions from occurring during font data processing, aligning with defensive programming practices recommended by the OWASP Secure Coding Standards. Organizations should also consider implementing browser hardening measures and monitoring for suspicious web traffic patterns that might indicate exploitation attempts.