CVE-2026-113342: 
Google Chrome vulnerability analysis and mitigation

CVE-2026-113342 is a memory corruption vulnerability in the Network component of Google Chrome that allows a remote attacker to execute arbitrary code outside the browser sandbox via a crafted HTML page. It affects all versions of Google Chrome prior to 156.0.8078.47 on Windows, Mac, and Linux. The vulnerability was reported internally by Google on September 15, 2026, and patched on October 20, 2026, with the stable channel release of Chrome 156. It carries a CVSS v3.1 base score of 9.6 (Critical) per Feedly threat intelligence, though Google's internal Chromium severity rating is listed as Medium (Chrome Advisory, Feedly).

The vulnerability is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), specifically a memory corruption flaw in Chrome's Network component. An attacker can exploit this by crafting a malicious HTML page that, when rendered by a vulnerable Chrome instance, triggers improper memory operations in the Network subsystem, ultimately allowing code execution outside the Chrome sandbox (sandbox escape). The attack requires user interaction — specifically, a victim must visit or be redirected to the attacker-controlled page — but requires no authentication or special privileges on the attacker's part. The Chromium bug tracker entry is issue #562024413, though full technical details remain restricted pending broad user patching (Chrome Advisory, Feedly).

Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code outside Chrome's sandbox with the privileges of the Chrome process on the victim's system, effectively achieving a full sandbox escape. This can lead to complete compromise of the affected host, including unauthorized access to sensitive data, installation of malware or persistent backdoors, and potential lateral movement within a network. All three security pillars — confidentiality, integrity, and availability — are rated as High impact given the CVSS v3.1 score of 9.6 with a Changed scope (Feedly).

As of the time of disclosure, there is no public proof-of-concept exploit and no evidence of in-the-wild exploitation (Feedly). The EPSS score is reported as 0.0, indicating a currently low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified. However, the sandbox escape capability and the network-based attack vector make this a high-value target if weaponized.

1. Reconnaissance: Identify potential victims using unpatched versions of Google Chrome (prior to 156.0.8078.47) via social engineering, phishing campaigns, or targeting known user populations.
2. Craft malicious HTML page: Develop a specially crafted HTML page that triggers the memory corruption vulnerability in Chrome's Network component when parsed or processed by the browser.
3. Deliver payload: Host the malicious page on an attacker-controlled server or inject it into a legitimate site via a watering hole attack; lure the victim to visit the page through phishing emails, malicious ads, or social media links.
4. Trigger memory corruption: When the victim's Chrome browser loads the page, the Network component processes malformed data, causing an out-of-bounds memory operation (CWE-119) that corrupts process memory.
5. Achieve sandbox escape and code execution: Exploit the memory corruption to redirect code execution flow outside the Chrome sandbox, gaining the ability to run arbitrary code with Chrome's OS-level privileges on the victim's machine (Chrome Advisory, Feedly).

• Network: Unusual outbound connections from the Chrome process to unknown external IPs following a web page visit; HTTP/HTTPS requests to newly registered or suspicious domains serving crafted HTML content.
• Process: Unexpected child processes spawned by the Chrome renderer or browser process (e.g., cmd.exe, powershell.exe, /bin/bash, curl, wget) that are not typical browser subprocesses; Chrome processes running with elevated or unexpected privileges.
• File System: Unexpected files written to user profile directories, temp folders, or startup locations by the Chrome process; new executables or scripts dropped in %APPDATA%, /tmp, or similar locations shortly after browser activity.
• Logs: Browser crash reports or unexpected termination logs in Chrome's crash reporting system; system event logs showing process creation anomalies originating from the Chrome binary.

Google has released a patch in Chrome version 156.0.8078.47 (Linux) and 156.0.8078.47/.48 (Windows/Mac), which addresses this vulnerability along with 352 other security fixes. Users and organizations should update Google Chrome to version 156.0.8078.47 or later immediately by navigating to chrome://settings/help or enabling automatic updates. No configuration-based workaround is available; patching is the only effective remediation. Organizations managing enterprise Chrome deployments should prioritize this update across all endpoints given the critical sandbox escape potential (Chrome Advisory).