---
id: kb-2026-00017
title: WebAssembly (Wasm) 3.0
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: af-webassembly-1
    statement: The W3C WebAssembly Core Specification defines WebAssembly as a low-level virtual instruction set architecture.
    source_title: WebAssembly Core Specification
    source_url: https://www.w3.org/TR/wasm-core-2/
    confidence: medium
  - id: af-webassembly-2
    statement: The original WebAssembly paper presents Wasm as a compact, safe, portable low-level code format for the web.
    source_title: Bringing the Web up to Speed with WebAssembly
    source_url: https://doi.org/10.1145/3062341.3062363
    confidence: medium
  - id: af-webassembly-3
    statement: MDN describes WebAssembly as a compilation target for languages such as C, C++, and Rust that can run on the web.
    source_title: WebAssembly concepts
    source_url: https://developer.mozilla.org/en-US/docs/WebAssembly/Guides/Concepts
    confidence: medium
completeness: 0.9
known_gaps:
  - Host integration details outside the browser
  - Runtime support differences across engines and embedding environments
disputed_statements: []
primary_sources:
  - id: ps-webassembly-1
    title: WebAssembly Core Specification
    type: standard
    year: 2022
    institution: W3C
    url: https://www.w3.org/TR/wasm-core-2/
  - id: ps-webassembly-2
    title: Bringing the Web up to Speed with WebAssembly
    type: academic_paper
    year: 2017
    institution: ACM PLDI
    url: https://doi.org/10.1145/3062341.3062363
  - id: ps-webassembly-3
    title: WebAssembly concepts
    type: technical_documentation
    year: 2024
    institution: MDN Web Docs
    url: https://developer.mozilla.org/en-US/docs/WebAssembly/Guides/Concepts
secondary_sources: []
updated: '2026-05-28'
---
## TL;DR
WebAssembly is a portable low-level code format and execution model. This repair downgrades the article from high to medium confidence and removes future Wasm 3.0 claims.

## Core Explanation
Wasm is commonly used as a compilation target for languages that need predictable, sandboxed execution in web and embedded environments. Its guarantees come from the specification and engine behavior, not from any single future announcement.

## Detailed Analysis
The public article now rests on the W3C core specification, the original PLDI paper, and MDN's conceptual documentation. That is enough for a medium-confidence overview while avoiding speculative release claims.