Google Chrome CVE-2026-11149

Exploitation requires three concrete prerequisites: (1) the attacker must have already compromised Chrome's renderer process via a separate vulnerability, since this bug is a sandbox-escape primitive rather than an initial-access bug; (2) the victim must visit attacker-controlled or attacker-influenced web content that serves a crafted HTML page (UI:R user interaction is required per the CVSS vector); and (3) Chrome must be running a vulnerable version prior to 149.0.7827.53. Limiting factors that reduce realistic risk: high attack complexity (AC:H) per the CVSS vector, the dependency on chaining with a renderer RCE, and the absence of observed exploitation per CISA SSVC. No specific non-default configuration or particular extension needs to be installed - the vulnerable code path lives in Chrome's own Extensions component.

Signals are mixed and should be weighed carefully. CVSS 7.5 (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects high impact but also high attack complexity and required user interaction, and crucially the description states the attacker must have ALREADY compromised the renderer process - meaning real-world exploitation requires chaining this bug with a separate renderer RCE. CISA's SSVC assessment aligns with this: Exploitation=none, Automatable=no, Technical Impact=total, indicating high damage potential but no observed in-the-wild use and no mass-exploitation pattern. Google's own Chromium rating is Medium, which is closer to operational reality than NVD's High score. No public exploit identified at time of analysis and EPSS data was not provided. Net: this is a meaningful patch-soon issue (sandbox escapes are the crown jewels of browser exploit chains) but it is not a standalone drop-everything emergency for most environments - prioritize behind any unpatched renderer-RCE CVEs in the same release.

An attacker first lures a victim to a malicious or compromised website that exploits a separate, currently-unpatched renderer vulnerability to gain code execution inside Chrome's sandboxed renderer process. From that foothold, attacker-controlled HTML/JS sends specially crafted, malformed input across the renderer-to-browser IPC boundary into the Extensions component, where insufficient validation lets the renderer trigger privileged operations and escape the sandbox, yielding broader execution on the user's account. No public exploit identified at time of analysis, so this scenario is presently theoretical and would require chaining with another bug.