Issues

• closeFile calls flush() on read-only OPFS handles → NoModificationAllowedError on every opfs:// read (1.33.1-dev114.0)

  duckdb/duckdb-wasm#2307 · Filter by author namankumawat13 opened on Nov 11, 2026

• If-Match header is URI-encoded, so every remote read fails on the DuckDB 2.0 build

  duckdb/duckdb-wasm#2306 · Filter by author cboettig opened on Nov 9, 2026

• DuckDB-WASM 2.0 Quack compatibility issue with threads

  duckdb/duckdb-wasm#2305 · Filter by author mattmartin14 opened on Nov 8, 2026

• Concurrent db.open() on one origin fails

  duckdb/duckdb-wasm#2303 · Filter by author jheer opened on Nov 4, 2026

• db.open() fails for in-memory databases where OPFS is unavailable (1.33.1-dev110 and later)

  duckdb/duckdb-wasm#2302 · Filter by author tobilg opened on Nov 4, 2026

• Arrow export of GEOMETRY columns with a CRS fails.

  duckdb/duckdb-wasm#2301 · Filter by author jheer opened on Nov 3, 2026

• JavaScript CI jobs check out native sources they do not build

  duckdb/duckdb-wasm#2295 · Filter by author rustyconover opened on Oct 26, 2026

• Main workflow runs twice for newly created refs

  duckdb/duckdb-wasm#2293 · Filter by author rustyconover opened on Oct 26, 2026

• CI serializes Wasm builds behind unused test-data generators

  duckdb/duckdb-wasm#2291 · Filter by author rustyconover opened on Oct 26, 2026

• Threaded extension loading loses dlerror details and can hang with maximumThreads: 2 (v2 / dev110)

  duckdb/duckdb-wasm#2288 · Filter by author ilyabo opened on Oct 23, 2026

• Spilled hash join returns a wrong count, then hangs (Node blocking binding, temp_directory)

  duckdb/duckdb-wasm#2277 · Filter by author leopsidom opened on Oct 17, 2026
  2

• wasm_mvp: every DuckDB error surfaces as ReferenceError: _setThrew is not defined

  duckdb/duckdb-wasm#2267 · Filter by author niko86 opened on Oct 12, 2026
  1

• read_csv auto-detect over ~45+ distinct HTTP paths fails with a misleading Binder Error (Candidate bindings: "column0")

  duckdb/duckdb-wasm#2266 · Filter by author shijianjs opened on Oct 10, 2026

• FLOAT and DECIMAL values are rendered with raw underlying representation instead of DuckDB-formatted values

  duckdb/duckdb-wasm#2264 · Filter by author nina-mi opened on Oct 7, 2026

• Upgrade apache-arrow to eliminate broken arrow2csv bin metadata in 1.32.0

  duckdb/duckdb-wasm#2263 · Filter by author Connor-Vandenberg opened on Oct 7, 2026
  3

• Support external extension repositories (DuckDB v2.0)

  duckdb/duckdb-wasm#2262 · Filter by author VGSML opened on Oct 5, 2026
  1

• Request headers and POST/PUT bodies silently corrupted once the wasm heap passes 2 GiB (signed pointers in http_wasm.cc)

  duckdb/duckdb-wasm#2258 · Filter by author rustyconover opened on Sep 23, 2026

• COI (pthreads) bundle: RangeError: offset is out of bounds in insertArrowFromIPCStream / registerFileBuffer — bindings copy through a stale Module.HEAPU8 after a worker thread grows the shared memory

  duckdb/duckdb-wasm#2256 · Filter by author dmetelin opened on Sep 22, 2026

• Authorization/sensitive header values logged to browser console unconditionally

  duckdb/duckdb-wasm#2254 · Filter by author samuelalvesg opened on Aug 27, 2026

• Blocking Node runtime: extension loading deadlocks (no error) on any failure or non-default configuration — offline LOAD hangs forever

  duckdb/duckdb-wasm#2252 · Filter by author david-morales opened on Aug 17, 2026
  1

• DuckDB-Wasm Shell renders blank results for timezone-aware timestamps

  duckdb/duckdb-wasm#2251 · Filter by author jr200 opened on Aug 8, 2026

• OPFS moveFile() corrupts files larger than 1MB

  duckdb/duckdb-wasm#2248 · Filter by author jake-low opened on Aug 4, 2026

• DuckDB-Wasm non-dev versions lags seriously behind the main duckdb releases

  duckdb/duckdb-wasm#2244 · Filter by author RobinGeuze opened on Jul 17, 2026
  2

• coi bundle: registering an OPFS file handle throws DataCloneError while pthread workers are running (FileSystemSyncAccessHandle is not structured-cloneable)

  duckdb/duckdb-wasm#2243 · Filter by author stuvet opened on Jul 15, 2026

• WASM extension builds silently drop extra static archives (Rust via corrosion, vcpkg staticlibs) — target_link_libraries doesn't reach the emcc post-build

  duckdb/duckdb-wasm#2283 · Filter by author sipemu opened on Jul 9, 2026