Issues

• Files.readFile() can hang: waits for the stderr control header before consuming stdout

  bug
  cloudflare/sandbox-sdk#935 · Filter by author ccorda opened on Oct 4, 2026
  

• Files.readFile() sometimes never resolves in local dev: waits on the stderr control frame before draining stdout

  bug
  cloudflare/sandbox-sdk#934 · Filter by author eashish93 opened on Oct 1, 2026
  

• openLogs waits for the status read before it opens the subscription

  enhancement
  cloudflare/sandbox-sdk#933 · Filter by author rikbrown opened on Oct 1, 2026
  

• Skip the runtime probe in doEstablish when the control session is live

  cloudflare/sandbox-sdk#932 · Filter by author rikbrown opened on Oct 1, 2026
  1

• outboundByHost / setAllowedHosts silently no-op for exec()-spawned process traffic on @next (no placement block)

  bug
  cloudflare/sandbox-sdk#930 · Filter by author NOVALYTH opened on Sep 28, 2026
  

• SandboxProcess holds an RPC stub that callers cannot dispose; in local dev its GC can crash workerd

  cloudflare/sandbox-sdk#929 · Filter by author rikbrown opened on Sep 24, 2026

• RPC transport: onStop() disposes an unconnected client on a refused container start, so the first call fails ~1s in and the container is orphaned

  cloudflare/sandbox-sdk#928 · Filter by author evan108108 opened on Sep 23, 2026

• utils.getRuntimeMetadata is not a function on real Cloudflare deployment (works fine with wrangler dev locally)

  cloudflare/sandbox-sdk#925 · Filter by author anax-daisuke-murai opened on Sep 23, 2026

• Preview proxy forwards WebSocket upgrades with the public preview Host, plain requests with localhost:<port>

  bug
  cloudflare/sandbox-sdk#917 · Filter by author alexiglesias93 opened on Sep 22, 2026
  

• R2/S3 mount outbound override is dropped when a Durable Object with a running container is reset (r2EgressMount only registered during mountBucket)

  bug
  cloudflare/sandbox-sdk#912 · Filter by author LiyanChen-X opened on Sep 15, 2026
  

• Bridge: let long, quiet exec commands run past the 5-minute stream idle timeout

  enhancement
  cloudflare/sandbox-sdk#911 · Filter by author hassnalalshaikh opened on Sep 12, 2026
  

• mountBucket on an already-mounted path unmounts the live mount (0.9.4–0.12.9): validation error runs the failed-mount cleanup

  cloudflare/sandbox-sdk#905 · Filter by author HillaryHauger opened on Sep 10, 2026
  1

• Mounting N buckets costs N × 7 sequential round trips; 3 mounts = 5.2s, ~40% of our cold start

  enhancement
  cloudflare/sandbox-sdk#897 · Filter by author LiyanChen-X opened on Sep 2, 2026
  

• Session teardown kills all startProcess-managed process trees while the container keeps serving

  cloudflare/sandbox-sdk#891 · Filter by author ucinar opened on Aug 28, 2026

• Backup restore of large (>=10MB) archives is unrecoverable: parallel download script ends in exit 1, which kills the persistent backup session shell

  cloudflare/sandbox-sdk#884 · Filter by author ken8203 opened on Aug 25, 2026
  1

• Local R2 mount at /data repeatedly fails reverse-sync watcher because watch() requires /workspace

  bug
  cloudflare/sandbox-sdk#883 · Filter by author SeanSanker opened on Aug 24, 2026
  

• tunnels.get() is not idempotent in wrangler dev: second call throws 'Tunnel recovery attempts were exhausted' on a healthy tunnel and never recovers

  bug
  cloudflare/sandbox-sdk#874 · Filter by author zmarques opened on Aug 18, 2026
  

• Usage with ai-sdk harness agent

  cloudflare/sandbox-sdk#872 · Filter by author bondz opened on Aug 14, 2026

• Local bucket mounts fail for large files and after DO restarts (six bugs, fixes on a branch)

  bug
  cloudflare/sandbox-sdk#864 · Filter by author danieljvdm opened on Aug 12, 2026
  

• Backup silently drops entire top-level directories: ... a/b exclude expansion over-excludes on mksquashfs 4.5 (ubuntu:22.04 base)

  bug
  cloudflare/sandbox-sdk#859 · Filter by author ken8203 opened on Aug 10, 2026
  2

  

• createOpencodeServer hangs when configured with OPENCODE_SERVER_PASSWORD

  bug
  cloudflare/sandbox-sdk#853 · Filter by author Hans-Robrecht opened on Aug 6, 2026
  1

  

• allowedHosts fails closed for approved hosts and setAllowedHosts does not enforce

  cloudflare/sandbox-sdk#844 · Filter by author JDP-Neo opened on Jul 24, 2026
  2

• STALE_PREVIEW_URL on every preview request despite healthy container (0.11.0)

  bug
  cloudflare/sandbox-sdk#829 · Filter by author omararambula opened on Jul 20, 2026
  3

  

• interceptHttps outbound handler mishandles Expect: 100-continue responses

  cloudflare/sandbox-sdk#814 · Filter by author yasonk opened on Jul 11, 2026

• How to call from workers/rs ?

  question
  cloudflare/sandbox-sdk#804 · Filter by author joeblew999 opened on Jul 2, 2026
  1