Kenneth Russell

The issue is related to the WebGL's `copyTexSubImage` method, where reading from areas outside the source resource could lead to potentially sensitive data disclosure due to uninitialized memory. This could result in the exposure of sensitive information.

The issue is related to the texSubImage2D implementation in the WebGL subsystem, which does not properly handle uploads to floating-point textures. This can be exploited by remote attackers via a crafted web page, potentially causing a denial of service through an assertion failure and application crash, or possibly having other unspecified impacts.