Issues

• 🐛 Bug Report — Runtime APIs: new_module_registry reports ~4× higher startup CPU for static imports (real cost or measurement phase?)

  cloudflare/workerd#8442 · Filter by author danieltroger opened on Nov 13, 2026

• Container fetch reuses a connection after an HTTP/1.0 response and peer FIN

  cloudflare/workerd#8433 · Filter by author JustYannicc opened on Nov 13, 2026

• 🐛 Bug Report — Runtime APIs: [1.20261113.1 regression] first process.stdout access throws, and keeps throwing, once Object.prototype has a "get" property

  cloudflare/workerd#8430 · Filter by author cnluzhang opened on Nov 13, 2026

• Hibernatable WebSockets: the runtime does not reply to a client's Close frame on compatibility dates ≥ 2026-04-07, although the docs say ws.close() in webSocketClose is no longer required

  cloudflare/workerd#8426 · Filter by author ganachain-labs opened on Nov 13, 2026

• R2Object.range returned by R2Bucket.get always has offset, length and suffix keys, which does not match its R2Range type

  cloudflare/workerd#8421 · Filter by author luisrudge opened on Nov 13, 2026

• Two workerd processes starting on one persisted state directory race on metadata.sqlite, and the loser dies with SQLITE_BUSY at startup

  cloudflare/workerd#8417 · Filter by author swalker326 opened on Nov 13, 2026

• 🐛 Bug Report — Runtime APIs: Hyperdrive .workers.alt hostname fails DNS resolution

  cloudflare/workerd#8391 · Filter by author ranile opened on Nov 12, 2026

• WebSocket upgrades never reuse a warm isolate, and placement.region spreads requests across many isolates

  cloudflare/workerd#8379 · Filter by author SvabhuG opened on Nov 12, 2026

• SIGTRAP at shutdown: CHECK_EQ(reference_count_, 1) in IsolateGroup::ReleaseDefault (TearDownOncePerProcess), refcount=2 — workerd 1.20261023.1

  cloudflare/workerd#8370 · Filter by author jeffscottward opened on Nov 11, 2026

• new_module_registry increases Worker startup time; about 10 ms of it appears only with nodejs_compat

  cloudflare/workerd#8365 · Filter by author rikbrown opened on Nov 11, 2026

• cluster: alarm retry limit and backoff stop working after a cold wake, and a throwing constructor loops with no delay

  cloudflare/workerd#8351 · Filter by author rosalbito opened on Nov 11, 2026

• cluster: synchronous JS or Wasm longer than about 12 s exits the process, and one object can take down every node

  cloudflare/workerd#8350 · Filter by author rosalbito opened on Nov 11, 2026

• fix(types): ForwardableEmailMessage omits the documented canBeForwarded property

  cloudflare/workerd#8290 · Filter by author coygeek opened on Nov 8, 2026

• D1 regression since 2026-11-08: "VIEWs and/or subqueries nested too deep" (SQLITE_ERROR 7500) when a CTE is referenced more than ~100 times in one statement

  bug
  Bug

  cloudflare/workerd#8389 · Filter by author shakaikaku-png opened on Nov 8, 2026
  7

• TCP sockets: allow setting ALPN on connect() and startTls() (needed for PostgreSQL 17+ direct TLS)

  cloudflare/workerd#8287 · Filter by author dinodeSimon opened on Nov 8, 2026

• node:buffer: Buffer.alloc(size, fill, encoding) throws when fill is a number or a Buffer

  cloudflare/workerd#8286 · Filter by author trackoor opened on Nov 8, 2026
  1

• Streaming TextDecoder drops U+FEFF at the start of a chunk that follows an ASCII-only chunk

  cloudflare/workerd#8279 · Filter by author trackoor opened on Nov 7, 2026
  1

• Diagnosing hung RPC invocations when a WorkerEntrypoint forwards a Durable Object ReadableStream (Cloud observation)

  cloudflare/workerd#8278 · Filter by author rt33 opened on Nov 7, 2026

• 🐛 Bug Report — cluster: a large SQLite transaction fails with "capture lost"

  cloudflare/workerd#8275 · Filter by author danizord opened on Nov 7, 2026

• 🐛 Bug Report — Runtime APIs: Synchronized 1006 WebSocket disconnects followed by same-version Durable Object restart

  cloudflare/workerd#8244 · Filter by author bojanvidanovic opened on Nov 5, 2026

• 🐛 Bug Report — Runtime APIs: Hosted hibernatable WebSocket close callbacks delayed up to 17 minutes after server close requests

  cloudflare/workerd#8243 · Filter by author bojanvidanovic opened on Nov 5, 2026

• Promises created in optimized code have no context tag, so a request awaiting one resumes in the wrong request

  cloudflare/workerd#8228 · Filter by author quantizor opened on Nov 5, 2026

• Bug Report — Runtime APIs - concurrent env.AI.run() calls can return responses in the wrong format

  cloudflare/workerd#8203 · Filter by author nick-tsiones opened on Nov 3, 2026

• Intermittent linux-x64 SIGSEGV during local D1 operations — workerd 1.20260515.1

  cloudflare/workerd#8190 · Filter by author contactpjpanda-PjHq opened on Nov 3, 2026

• Cold hibernating Durable Object remains physically closing after a server-initiated Close

  cloudflare/workerd#8185 · Filter by author Mirksen opened on Nov 3, 2026