CVE-2026-87470 in Chrome
Summary
by MITRE • 09/09/2026
Improper quantity validation in Tint in Google Chrome on on Mac prior to 153.0.8010.36 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an improper quantity validation flaw within the Tint component of Google Chrome on macOS prior to version 153.0.8010.36 represents a significant breach in memory safety and input sanitization protocols. This specific defect resides within the rendering engine's handling of shader compilation processes, where Tint serves as an intermediate representation for graphics shaders. The core technical flaw involves insufficient validation of array bounds or loop counters during the processing of crafted HTML content that triggers WebGL operations. When a remote attacker hosts a malicious webpage containing specially constructed JavaScript and WebGL code, they can manipulate these internal data structures to exceed expected limits. This overflow condition allows for out-of-bounds memory access, which is critical because it bypasses the standard sandboxing mechanisms designed to isolate browser processes from the underlying operating system.
From an operational perspective, this vulnerability enables a remote attacker to achieve arbitrary code execution with elevated privileges relative to the Chrome sandbox environment. The impact extends beyond simple data corruption or denial of service; successful exploitation allows for the injection and execution of malicious payloads directly on the host machine. This effectively neutralizes the security boundary that separates untrusted web content from sensitive system resources, potentially leading to full device compromise. Attackers can leverage this flaw to install malware, exfiltrate user credentials stored in browser profiles, or establish persistent access points within the network infrastructure connected to the affected endpoint. The severity is rated as medium by Chromium standards due to the complexity required for reliable exploitation and the availability of mitigating factors such as sandboxing, yet the potential impact remains high given the ability to escape the containerized environment.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-120, which describes buffer copy without checking size limits, specifically manifesting here through improper validation leading to out-of-bounds writes or reads. In terms of offensive security frameworks, this exploit path corresponds to MITRE ATT&CK technique T1203, which covers exploitation for client execution, and potentially touches upon privilege escalation vectors if the sandbox escape is successfully leveraged to gain higher system permissions. The attack vector is classified as remote (AV:N) with low complexity (AC:L), requiring user interaction only in the sense of visiting a malicious website or having it auto-load via drive-by download mechanisms.
Mitigation strategies primarily involve immediate patching by upgrading Google Chrome to version 153.0.8010.36 or later, which contains the necessary code fixes for input validation within the Tint shader compiler. Organizations should enforce automated update policies across all endpoints running macOS to ensure timely deployment of security patches. Additionally, implementing strict content security policies and disabling WebGL in environments where it is not strictly required can reduce the attack surface. Security operations teams should monitor network traffic for indicators of compromise associated with known exploit kits targeting browser vulnerabilities and utilize endpoint detection and response tools to identify anomalous process creation patterns that may indicate successful exploitation attempts.