Issues

• [interpreter] Binary decoder rejects heap type indices >= 2^31 as malformed

  WebAssembly/spec#2289 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] (memory 65536) aborts the interpreter with an uncaught SizeOverflow

  WebAssembly/spec#2288 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] Text lexer accepts surrogate escapes and crashes on escapes past U+10FFFF

  WebAssembly/spec#2287 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] exnref values get their tag's type, so casts give wrong results and stores crash

  WebAssembly/spec#2286 · Filter by author kiranandcode opened on Oct 20, 2026

• [spectec] SpecTec interpreter: array.new_data and array.init_data fail on arrays of v128

  WebAssembly/spec#2285 · Filter by author kiranandcode opened on Oct 20, 2026

• [spectec] Tstringchar excludes \u{E000}..\u{E7FF}

  WebAssembly/spec#2284 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] f32x4.relaxed_madd double-rounds through an f64 fma

  WebAssembly/spec#2283 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] f32 literals just above half the smallest subnormal round to zero

  WebAssembly/spec#2282 · Filter by author kiranandcode opened on Oct 20, 2026

• [interpreter] memory.grow on an i64 memory past 2^48 pages succeeds but allocates wrong amount (or crashes)

  WebAssembly/spec#2281 · Filter by author kiranandcode opened on Oct 20, 2026

• il2al: host function rules become two independent conditionals and ignore the new store s'

  WebAssembly/spec#2279 · Filter by author tamaroning opened on Oct 14, 2026
  6

• Spec interpreter/implementation discrepancy - a local with an invalid type and 0 count

  WebAssembly/spec#2258 · Filter by author alexcrichton opened on Oct 2, 2026
  4

• [js-api] A mutable global import allocates a const global before LinkError

  WebAssembly/spec#2253 · Filter by author chicoxyzzy opened on Sep 28, 2026

• [spectec] Wasm 1.0: $instantiate missing premises

  WebAssembly/spec#2245 · Filter by author lzy0505 opened on Sep 4, 2026

• Incorrect implementations of unreachable ref.as_non_null validation

  WebAssembly/spec#2235 · Filter by author tlively opened on Aug 28, 2026
  9

• [spectec] Missing and wrong side conditions in the middle-end

  WebAssembly/spec#2196 · Filter by author zilinc opened on Jun 23, 2026

• Structured cloning of WebAssembly.Memory is not defined

  WebAssembly/spec#2155 · Filter by author annevk opened on May 4, 2026
  2

• Double rounding fix is (still) wrong in Windows

  WebAssembly/spec#2150 · Filter by author lifthrasiir opened on Apr 23, 2026
  1

• Simplify JS-API test syncing

  WebAssembly/spec#2130 · Filter by author eqrion opened on Mar 31, 2026
  5

• [js-api] Ambiguity in WebAssembly.instance() importObject requirement with JS builtins imports

  WebAssembly/spec#2102 · Filter by author SamVerschueren opened on Mar 9, 2026
  1

• Should importing or exporting a function count as declaring it for ref.func?

  WebAssembly/spec#2072 · Filter by author eqrion opened on Feb 4, 2026
  17

• Some links in the archived version of the W3C/bikeshed version of the Wasm spec are broken

  WebAssembly/spec#2051 · Filter by author wucke13 opened on Jan 12, 2026
  1

• Minor errors in 3.0 binary format

  WebAssembly/spec#2041 · Filter by author conrad-watt opened on Dec 8, 2025
  1

• [js-api] Is the exception propagation model used consistently?

  WebAssembly/spec#2040 · Filter by author ShinWonho opened on Dec 4, 2025

• [spec] Missing hyperlink for .refs in table.set reduction rule prose

  WebAssembly/spec#2039 · Filter by author alessiofaieta opened on Dec 3, 2025
  

• [js-api] Ambiguity in WebAssembly.instantiate(bytes) if WebAssembly.Module is a thenable

  WebAssembly/spec#2034 · Filter by author backes opened on Nov 26, 2025
  3