CVE-2026-113343: 
Google Chrome vulnerability analysis and mitigation

CVE-2026-113343 is a memory corruption vulnerability in the Sandbox component of Google Chrome that allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. It affects Google Chrome versions prior to 156.0.8078.47 on Windows, Mac, and Linux. The vulnerability was reported internally by Google on 2026-04-14 and publicly disclosed on 2026-10-20 as part of the Chrome 156 stable channel release. It carries a CVSS v3.1 base score of 8.8 (High) and is rated Medium severity by Chromium's internal severity scale (Google Chrome Advisory).

The vulnerability is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), manifesting as memory corruption within Chrome's Sandbox component. An attacker can exploit this by crafting a malicious HTML page that, when rendered by a vulnerable Chrome instance, triggers improper memory operations within the sandbox environment. Exploitation requires user interaction — specifically, a victim must visit or be redirected to the attacker-controlled page. The Chromium issue tracker references bug ID 502376419, though full technical details remain restricted pending broad user adoption of the patch (Google Chrome Advisory).

Successful exploitation allows a remote attacker to execute arbitrary code within the Chrome sandbox, compromising the integrity and confidentiality of data processed within the browser process. While the sandbox boundary limits direct host OS compromise, this vulnerability could serve as a stepping stone in a sandbox escape chain when combined with additional privilege escalation bugs. Affected users on all desktop platforms (Windows, Mac, Linux) running Chrome prior to 156.0.8078.47 are at risk of browser-level code execution, potential data theft, and further exploitation of the underlying system (Google Chrome Advisory).

As of the disclosure date, there is no public proof-of-concept exploit and no evidence of in-the-wild exploitation (Google Chrome Advisory). The EPSS score is reported as 0.0, reflecting low current exploitation probability, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Exploitation is not automatable and requires user interaction (visiting a crafted page), which reduces the immediate risk compared to fully remote, zero-click vulnerabilities. No threat actor attribution has been identified at this time.

Google has released Chrome 156.0.8078.47 (Linux) and 156.0.8078.47/.48 (Windows/Mac) which address this vulnerability. Users and administrators should update Google Chrome to version 156.0.8078.47 or later immediately. Enabling automatic updates is strongly recommended to ensure timely application of future security patches. As a temporary measure where immediate patching is not feasible, restricting user access to untrusted or unknown websites can reduce exposure (Google Chrome Advisory).