# Deno v2.9.6

- Product: Deno (https://whatsnew.fyi/product/deno)
- Vendor: Deno
- Date: 2026-08-27
- Version: v2.9.6
- Original notes: https://github.com/denoland/deno/releases/tag/v2.9.6
- Permalink: https://whatsnew.fyi/product/deno/releases/v2.9.6

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add support for 'text/x-component' content type in compressible
- **added** — Add clipboard API for desktop
- **added** — Support checked, icon, and tooltip on desktop menu items
- **fixed** — Isolate esbuild downloads from workspace registries
- **fixed** — Combine duplicate headers for Vary matching in cache
- **fixed** — Remove orphaned sync-types parser
- **fixed** — Cap adaptive buffer initial allocations in core
- **fixed** — Make Unix pipe fd ownership explicit in core
- **fixed** — Make user timer waker state thread-safe in core
- **fixed** — Compare a range against a line in V8's units for coverage
- **fixed** — Preserve RSA-OAEP label bytes in crypto
- **fixed** — Keep dots in the app name when resolving the runtime library in desktop
- **fixed** — Keep the macOS bundle signature valid unless an update is applied in desktop
- **fixed** — Never block the JS thread on the error-report dialog in desktop
- **fixed** — Propagate deno.json version and license into packaged installers in desktop
- **fixed** — Run Vite-based HMR dev servers inside the desktop runtime
- **fixed** — Transport binding args and results as DesktopValue so Uint8Array survives in desktop
- **fixed** — Enforce permissions for proxy transports in ext/fetch
- **fixed** — Only retry transport errors on pooled connections in ext/fetch
- **fixed** — Raise default HTTP/2 SETTINGS_MAX_HEADER_LIST_SIZE to 256KB in ext/fetch

###### 2.9.6 / 2026.08.27

- feat(compressible): add support for 'text/x-component' content type (#36450)
- feat(desktop): clipboard api (#35750)
- feat(desktop): support checked, icon, and tooltip on menu items (#36649)
- fix(bundle): isolate esbuild downloads from workspace registries (#36467)
- fix(cache): combine duplicate headers for Vary matching (#36476)
- fix(cli_parser): remove orphaned sync-types parser
- fix(core): cap adaptive buffer initial allocations (#36432)
- fix(core): make Unix pipe fd ownership explicit (#36353)
- fix(core): make user timer waker state thread-safe (#36495)
- fix(coverage): compare a range against a line in V8's units (#36613)
- fix(crypto): preserve RSA-OAEP label bytes (#36441)
- fix(desktop): keep dots in the app name when resolving the runtime library
  (#36006)
- fix(desktop): keep the macOS bundle signature valid unless an update is
  applied (#36574)
- fix(desktop): never block the JS thread on the error-report dialog (#36575)
- fix(desktop): propagate deno.json version and license into packaged installers
  (#36577)
- fix(desktop): run Vite-based HMR dev servers inside the desktop runtime
  (#36488)
- fix(desktop): transport binding args and results as DesktopValue so Uint8Array
  survives (#36573)
- fix(ext/fetch): enforce permissions for proxy transports (#36217)
- fix(ext/fetch): only retry transport errors on pooled connections (#36415)
- fix(ext/fetch): raise default HTTP/2 SETTINGS_MAX_HEADER_LIST_SIZE to 256KB
  (#36558)
- fix(ext/http): keep request body readable after response is sent (#36629)
- fix(ext/http): route invalid async responses to onError (#36437)
- fix(ext/napi): don't invoke napi_wrap finalizer twice at teardown (#36556)
- fix(ext/napi): run JS-calling finalizers safely, NULL string result, and
  Float16Array (#36572)
- fix(ext/napi): surface OS error and path on addon load failure (#36630)
- fix(ext/napi): track pending finalizers by identity (#36551)
- fix(ext/napi): wake the event loop at the next uv_timer deadline (#36559)
- fix(ext/net): skip unsupported DNS records in ANY queries (#36650)
- fix(ext/node): accept string ports in dns.lookupService (#36546)
- fix(ext/node): build the proxied request target with the URL parser (#36557)
- fix(ext/node): do not resume client TLS sessions unless requested (#36592)
- fix(ext/node): fix perf_hooks detail.req.url proxied path duplication (#36407)
- fix(ext/node): handle readv short reads (#36211)
- fix(ext/node): require sys permission for inspector.open (#36465)
- fix(ext/node_sqlite): invalidate sessions on database close (#36633)
- fix(ext/tls): avoid panic for mismatched client certificate and key (#36457)
- fix(ext/web): clean up abort handlers when listeners are removed (#36226)
- fix(ext/web): close transfer MessagePort when a transferred readable is
  cancelled (#36270)
- fix(ext/web): snapshot SharedArrayBuffer input in TextDecoder.decode()
  (#36611)
- fix(fetch): require an initial multipart boundary (#36470)
- fix(ffi): validate struct return buffers (#36373)
- fix(fmt): honor .editorconfig when formatting from stdin (#36267)
- fix(fs): require write permission for creating opens (#36497)
- fix(fs): use a private FsFile constructor token (#36439)
- fix(glob): retain valid gitignore rules after parse errors (#36478)
- fix(http): preserve keep-alive after reading request body (#36690)
- fix(http): truncate streaming responses to content length (#36496)
- fix(lsp): restrict registry completion endpoint schemes (#36477)
- fix(node): check reads during require resolution (#36461)
- fix(node): match domain uncaught exception handling (#36475)
- fix(node): preserve v8 deserializer view offsets (#36460)
- fix(node): validate Brotli encoder operations (#36530)
- fix(node): validate raw outgoing HTTP headers (#36471)
- fix(node/crypto): preserve binary key export passphrases (#36443)
- fix(node_crypto): apply RFC 7748 scalar decoding for X448 (#3646

_[Truncated at 4000 characters — full notes: https://github.com/denoland/deno/releases/tag/v2.9.6]_