← Claude Code

Claude Code 2.1.278

Released Sep 19, 2026 · official source

Safe to upgrade? Many reports – consider waiting

15 bug/regression-labelled issues opened in the 72h after release (15 regression-flagged, 2 mention v2.1.278 in title). Normalised score 45.0.

Issues counted
  • #95958 Claude in Chrome extension OAuth still fails with "Authorization failed" — recurrence of #69051/#34176, both now closed/locked (bug, has repro, platform:macos, area:auth, regression, area:browser-extension)
  • #95910 [BUG] Cowork Plan9 mount fails (errno=22) on Release Preview 26300.9539 — despite KB5129195 fix already present in the build (bug, platform:windows, area:cowork, regression, area:desktop)
  • #95893 [BUG] Desktop: session cannot be resumed ("Git is installed but isn't working") because the worktree pool refuses the session's own recorded worktree (bug, platform:macos, regression, area:desktop)
  • #95877 [BUG] Claude VS extension No ide_selection context but existent selected file/line (bug, has repro, platform:macos, platform:vscode, regression)
  • #95873 [BUG] Regression since ~2026-09-12: Remote Control sessions have 0 teleport-events, so opening them from another machine (VS Code Remote tab / --teleport) yields an empty session (worked 2026-08-26 → 09-11) (bug, has repro, platform:windows, area:ide, platform:vscode, regression)
  • #95808 [BUG] sparsePaths git marketplaces clone empty since 2.1.274 (GIT_NO_LAZY_FETCH=1 on a blob:none clone; git ≤2.34 exits 0) and silently replace healthy clones — 2.1.278 retry never fires (bug, has repro, platform:linux, platform:vscode, regression, area:plugins, data-loss)
  • #95754 [BUG] Desktop 2.2553.1 (macOS): Run button on bash blocks and markdown links do nothing on click in Code tab (bug, platform:macos, regression, area:desktop)
  • #95735 [Desktop 2.2553.1.0] Slash picker opens only at position 0, even after an accepted /skill (bug, duplicate, has repro, platform:windows, regression, area:skills, area:desktop)
  • #95686 [BUG] Claude Code Extension change to how code text is quoted now means code is grey on grey cant read it! (bug, platform:macos, platform:vscode, regression, area:ui)
  • #95661 [BUG] Claude Desktop (Windows): Browser pane tools stopped working mid-session - calls routed to /mcp/servers/Claude%20Browser/ and rejected with 400 "server_uuid: Input should be a valid UUID" (bug, platform:windows, area:mcp, area:cowork, regression, area:desktop)
  • #95633 2.1.275: switching a bypassPermissions session to plan mode routes every read-only Bash call to canUseTool (regression from 2.1.246) (bug, has repro, platform:linux, regression, area:agent-sdk, area:permissions)
  • #95592 [BUG] Desktop: one-time scheduled tasks vanish from the Scheduled/Routines list (recurring tasks unaffected; tasks still exist underneath) (bug, platform:linux, regression, area:desktop, area:routines)
  • #95560 [BUG] 2.1.277: sandbox.excludedCommands no longer matches an executable whose basename is `read` (bug, has repro, platform:macos, regression, area:sandbox)
  • #95532 [BUG] 2.1.278: a file redirection on a single excluded command defeats sandbox.excludedCommands (gh fails TLS) (bug, has repro, platform:macos, regression, area:sandbox)
  • #95525 [BUG] Cowork built-in browser panel disappears after app update 2.2553.0 → 2.2553.1.0 (Windows): its tools return 400, then vanish from the tool set after restart (bug, has repro, platform:windows, area:cowork, regression, area:desktop)

How this is computed

Changelog: v2.1.278

What's changed