[Vektor T-13]

WebAssembly opens up new possibilities for browser fingerprinting: code execution characteristics can be used to analyze the underlying hardware environment and detect VMs, VPSs, and server hardware.

Let’s explore how JavaScript + WASM work together to create a fingerprint, how this technology differs from the familiar Canvas, WebGL, and WebRTC methods, and why it is becoming increasingly important for anti-fraud systems and anti-detect browser developers.

https://webinar.detect.expert/en/webinar...-browsers/

[Tor]

WebAssembly opens up new possibilities for browser fingerprinting: code execution characteristics can be used to analyze the underlying hardware environment and detect VMs, VPSs, and server hardware.

Let’s explore how JavaScript + WASM work together to create a fingerprint, how this technology differs from the familiar Canvas, WebGL, and WebRTC methods, and why it is becoming increasingly important for anti-fraud systems and anti-detect browser developers.

https://webinar.detect.expert/en/webinar...-browsers/

This is being massively oversold. WebAssembly isn't some magic new fingerprinting layer that suddenly defeats modern browser protections.

WASM can absolutely be used for hardware/performance measurements, but moving fingerprinting logic from JavaScript into WASM doesn't inherently bypass browser-level anti-fingerprinting. Brave already attacks fingerprinting at the browser/API level by reducing, genericizing and randomizing fingerprintable information rather than simply trying to detect fingerprinting JavaScript.

There's even a 2025 paper specifically testing WASM-obfuscated fingerprinting https://arxiv.org/pdf/2508.21219. The interesting result was that source-code-based detectors could be fooled, while the tested native/browser-level defenses remained effective because their interception was independent of whether the fingerprinting logic was implemented in JS or WASM.

Execution-timing fingerprinting is a legitimate additional signal and isn't the same thing as Canvas/WebGL fingerprinting, so claiming it is completely solved would also be wrong. But presenting "WASM executes close to native therefore we can see through anti-fingerprinting browsers" skips the hardest part: obtaining a stable, sufficiently unique signal across load, scheduling, power states, thermal throttling, JIT/runtime differences and browser countermeasures.

Interesting fingerprinting vector? Yes.

Some revolutionary technique that makes modern browser anti-fingerprinting obsolete? The evidence presented here doesn't establish that.