CVE-2026-11121 is a Google Chrome (Chromium) security issue where Skia (the graphics library used by the browser) did not sufficiently validate untrusted input. In plain terms, a remote attacker who already had control of the Chrome renderer process could use a crafted HTML page to cause Chrome to leak cross-origin data. The affected scope is Chrome versions prior to 149.0.7827.53.
The NVD description attributes the problem to “insufficient validation of untrusted input in Skia.” The attack scenario described is specifically post-compromise of the renderer process: an attacker with a compromised renderer can trigger the data leak by using a crafted HTML page. While the provided references do not include additional technical details such as specific Skia functions, code paths, or a step-by-step mechanism, the core exploitation concept is that malformed or unexpected input reaches a Skia component without adequate validation, enabling cross-origin data exposure.
Impact is cross-origin data leakage—i.e., an attacker can potentially read information that should be isolated between different web origins. The NVD notes Chromium security severity as “Medium,” and the issue is categorized under CWE-20 (Improper Input Validation). The blast radius is limited by the prerequisite that the attacker must have already compromised the renderer process; without that condition, the described cross-origin leak path would not apply. Given the renderer-compromise requirement, real-world risk is primarily relevant to threat models involving renderer compromise (e.g., via another vulnerability or sandbox escape chain).
Mitigation: update Google Chrome to a version that includes the fix. The NVD description states the vulnerability exists in Chrome prior to 149.0.7827.53, so upgrading to Chrome 149.0.7827.53 or later should remediate the issue. No additional workarounds, configuration changes, or detection guidance are present in the provided reference content.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-20