tauri-runtime-cef-v3.0.0-alpha.2
puckeditor/pucktauri-runtime-cef-v3.0.0-alpha.2Sep 21, 2026by github-actions[bot]
Upgrading?
AI Summary
The Tauri CEF runtime v3.0.0-alpha.2 adds support for CEF downgrade policies, profile isolation via `data_store_identifier`, and fixes version reporting. It also bumps the Windows crate to fix build compatibility.
Key Highlights
- Added `Cef::downgrade` and `DowngradePolicy` for handling application rollbacks to older CEF versions
- Added `data_store_identifier` support for profile isolation
- Fixed `webview_version` reporting (swapped minor components)
- Bumped `windows` crate to 0.62 to fix Windows build
Breaking Changes
- `tauri_runtime::Error::CreateWindow` now carries the underlying error instead of just a string
New Features
- Downgrade policy support (KeepProfile and ResetProfile)
- Data store identifier support
- Documentation updates for unsupported CEF attributes
Full Release Notes
<details>
<summary><em><h4>Cargo Audit</h4></em></summary>
```
Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
Loaded 1258 security advisories (from /home/runner/.cargo/advisory-db)
Updating crates.io index
Scanning Cargo.lock for vulnerabilities (1226 crate dependencies)
Crate: fxhash
Version: 0.2.1
Warning: unmaintained
Title: fxhash - no longer maintained
Date: 2025-09-05
ID: RUSTSEC-2025-0057
URL: https://rustsec.org/advisories/RUSTSEC-2025-0057
Crate: paste
Version: 1.0.15
Warning: unmaintained
Title: paste - no longer maintained
Date: 2024-10-07
ID: RUSTSEC-2024-0436
URL: https://rustsec.org/advisories/RUSTSEC-2024-0436
Crate: rustls-pemfile
Version: 2.2.0
Warning: unmaintained
Title: rustls-pemfile is unmaintained
Date: 2025-11-28
ID: RUSTSEC-2025-0134
URL: https://rustsec.org/advisories/RUSTSEC-2025-0134
Crate: rustybuzz
Version: 0.20.1
Warning: unmaintained
Title: `rustybuzz` is unmaintained
Date: 2026-07-11
ID: RUSTSEC-2026-0206
URL: https://rustsec.org/advisories/RUSTSEC-2026-0206
Crate: ttf-parser
Version: 0.25.1
Warning: unmaintained
Title: `ttf-parser` is unmaintained
Date: 2026-06-28
ID: RUSTSEC-2026-0192
URL: https://rustsec.org/advisories/RUSTSEC-2026-0192
warning: 5 allowed warnings found
```
</details>
## [3.0.0-alpha.2]
### New Features
- [`e2af2c298`](https://www.github.com/tauri-apps/tauri/commit/e2af2c29824e675382ca9601ea5f1ec630504811) Added `Cef::downgrade` and `DowngradePolicy`, for an application whose release is rolled back to an older CEF. The runtime now records the Chromium version in the root cache path (`Last Version`, the breadcrumb Chrome's own downgrade manager keeps and CEF does not write) and, when a newer Chromium milestone last used the profile, either keeps it and logs a warning (`DowngradePolicy::KeepProfile`, the default and what Chrome does) or moves it aside so Chromium starts on an empty profile and deletes the old one in the background (`DowngradePolicy::ResetProfile`). A downgrade within a milestone, and a profile another running instance of the application holds, are left alone.
- [`9c3bb4d28`](https://www.github.com/tauri-apps/tauri/commit/9c3bb4d28b58d4ede705a04fe0c8cf96f6730ea3) `data_store_identifier` is now supported on the CEF runtime: the identifier names a profile directory under the runtime's cache path, giving the same isolation `data_directory` does (`data_directory` wins when both are set). The runtime also logs a warning when a webview sets an attribute it cannot honour — `transparent`, `accept_first_mouse`, `browser_extensions_enabled` / `extensions_path`, a `background_throttling` policy or an overlay `scroll_bar_style` — naming the runtime-wide `Cef` API that does the same thing where one exists. The attributes' documentation on `tauri` and `tauri-utils` now describes each one's CEF behaviour.
### Enhancements
- [`8d0e40b45`](https://www.github.com/tauri-apps/tauri/commit/8d0e40b45213afe90c98f624617974391f75da70) Log a warning when a webview sets `additional_browser_args`, which the CEF runtime does not support: Chromium's command line is per process, so switches go through `Cef::command_line_arg` instead. The attribute's documentation on `tauri`, `tauri-runtime` and `tauri-utils` now says so.
- [`e2af2c298`](https://www.github.com/tauri-apps/tauri/commit/e2af2c29824e675382ca9601ea5f1ec630504811) The build script now passes the CEF binary distribution `cef-dll-sys` resolved on to the build scripts of dependents, as `DEP_TAURI_RUNTIME_CEF_CEF_DIR`.
### Bug Fixes
- [`e2af2c298`](https://www.github.com/tauri-apps/tauri/commit/e2af2c29824e675382ca9601ea5f1ec630504811) `webview_version` now reports Chromium's version as `MAJOR.MINOR.BUILD.PATCH`; the last two components were swapped.
### Dependencies
- Upgraded to `tauri-utils@3.0.0-alpha.1`
- Upgraded to `tauri-runtime@3.0.0-alpha.1`
- Upgraded to `tauri-macros@3.0.0-alpha.1`
- Upgraded to `tauri@3.0.0-alpha.2`
- [`dfa2f0a5c`](https://www.github.com/tauri-apps/tauri/commit/dfa2f0a5c0516852ee6a7631dc2f4ed63bc4814f) Bump the `windows` crate to 0.62 to match `tauri-runtime`, fixing the Windows build (`HWND` type mismatch in the `WindowBuilder::owner`/`parent` implementations).
### Breaking Changes
- [`4e03a1bb2`](https://www.github.com/tauri-apps/tauri/commit/4e03a1bb298d95526b4c97fde0a367cde9b544c2) ([#16043](https://www.github.com/tauri-apps/tauri/pull/16043)) `tauri_runtime::Error::CreateWindow` now carries the underlying error (`CreateWindow(Box<dyn std::error::Error + Send + Sync>)`), like `CreateWebview`.
<details>
<summary><em><h4>Cargo Publish</h4></em></summary>
```
Updating crates.io index
Packaging tauri-runtime-cef v3.0.0-alpha.2 (/home/runner/work/tauri/tauri/crates/tauri-runtime-cef)
Updating crates.io index
Packaged 71 files, 841.5KiB (220.9KiB compressed)
Verifying tauri-runtime-cef v3.0.0-alpha.2 (/home/runner/work/tauri/tauri/crates/tauri-runtime-cef)
Downloading crates ...
Downloaded wayland-client v0.31.15
Downloaded unit-prefix v0.5.2
Downloaded as-raw-xcb-connection v1.0.1
Downloaded cairo-rs v0.22.9
Downloaded wayland-scanner v0.31.11
Downloaded cairo-sys-rs v0.22.9
Downloaded wayland-protocols v0.32.13
Downloaded wayland-sys v0.31.11
Downloaded x11rb v0.13.2
Downloaded winit-core v0.31.0-beta.3
Downloaded xcursor v0.3.11
Downloaded xkbcommon-dl v0.4.2
Downloaded wayland-backend v0.3.17
Downloaded winit-common v0.31.0-beta.3
Downloaded xkeysym v0.2.1
Downloaded x11rb-protocol v0.13.2
Downloaded block2 v0.6.2
Downloaded libloading v0.8.9
Downloaded objc2-encode v4.1.0
Downloaded polling v3.11.0
Downloaded proc-macro-crate v3.5.0
Downloaded dioxus-debug-cell v0.1.1
Downloaded download-cef v3.0.0
Downloaded gdk4 v0.11.4
Downloaded gdk-pixbuf-sys v0.22.9
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Downloaded html5ever v0.29.1
Downloaded kuchikiki v0.8.8-speedreader
Downloaded markup5ever v0.14.1
Downloaded nodrop v0.1.14
Downloaded pango v0.22.9
Downloaded pango-sys v0.22.9
Downloaded phf v0.10.1
Downloaded phf_generator v0.8.0
Downloaded rand_pcg v0.2.1
Downloaded servo_arc v0.2.0
Downloaded system-deps v9.0.0
Downloaded calloop v0.14.4
Downloaded dirs v6.0.0
Downloaded dlib v0.5.3
Downloaded downcast-rs v1.2.1
Downloaded fxhash v0.2.1
Downloaded gethostname v1.1.0
Downloaded phf_generator v0.10.0
Downloaded phf_shared v0.10.0
Downloaded scoped-tls v1.0.1
Downloaded string_cache_codegen v0.5.4
Downloaded siphasher v0.3.11
Downloaded cfg-expr v0.20.9
Downloaded cssparser v0.29.6
Downloaded cssparser-macros v0.6.1
Downloaded derive_more v0.99.20
Downloaded gdk4-sys v0.11.4
Downloaded gio-sys v0.22.9
Downloaded graphene-rs v0.22.8
Downloaded graphene-sys v0.22.9
Downloaded matches v0.1.10
Downloaded phf v0.8.0
Downloaded phf_shared v0.8.0
Downloaded cargo-platform v0.3.3
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Downloaded litrs v1.0.0
Downloaded phf v0.11.3
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Downloaded objc2 v0.6.4
Downloaded phf_codegen v0.11.3
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Downloaded objc2-foundation v0.3.2
Downloaded phf_generator v0.11.3
Downloaded portable-atomic v1.15.0
Downloaded rand_core v0.5.1
Downloaded rand v0.7.3
Downloaded rand_chacha v0.2.2
Downloaded quick-xml v0.41.0
Downloaded phf_macros v0.10.0
Downloaded proc-macro-hack v0.5.20+deprecated
Downloaded string_cache v0.8.9
Downloaded target-lexicon v0.13.5
Downloaded tendril v0.4.3
Downloaded console v0.16.4
Downloaded selectors v0.24.0
Downloaded toml_edit v0.25.13+spec-1.1.0
Downloaded match_token v0.1.0
Downloaded convert_case v0.4.0
Downloaded mac v0.1.1
Downloaded futf v0.1.5
Downloaded phf_codegen v0.8.0
Downloaded system-deps v7.0.8
Downloaded glib v0.22.9
Downloaded cef-dll-sys v152.3.0+152.0.6
Downloaded gdk4-x11 v0.11.4
Downloaded gdk-pixbuf v0.22.0
Downloaded gdk4-x11-sys v0.11.0
Downloaded cef v152.3.0+152.0.6
Downloaded gsk4-sys v0.11.4
Downloaded gdk4-wayland v0.11.4
Downloaded gtk4-macros v0.11.4
Downloaded tauri-winit-gtk4 v0.31.0-beta.3
Downloaded gsk4 v0.11.4
Downloaded gio v0.22.9
Downloaded gtk4 v0.11.4
Downloaded tauri-winit v0.31.0-beta.3
Downloaded gtk4-sys v0.11.4
Downloaded tauri-winit-x11 v0.31.0-beta.3
Downloaded gdk4-wayland-sys v0.11.0
Compiling serde_core v1.0.229
Compiling winnow v1.0.4
Compiling toml_datetime v1.1.1+spec-1.1.0
Compiling target-lexicon v0.13.5
Compiling system-deps v9.0.0
Compiling yoke v0.8.3
Compiling zerovec v0.11.8
Compiling cfg-expr v0.20.9
Compiling tinystr v0.8.4
Compiling toml_parser v1.1.3+spec-1.1.0
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Compiling icu_locale_core v2.3.0
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Compiling icu_collections v2.3.0
Compiling serde v1.0.229
Compiling bitflags v2.13.1
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Compiling getrandom v0.2.17
Compiling zerocopy v0.8.56
Compiling icu_properties v2.3.0
Compiling semver v1.0.28
Compiling glib-sys v0.22.9
Compiling gobject-sys v0.22.9
Compiling system-deps v7.0.8
Compiling gio-sys v0.22.9
Compiling futures-util v0.3.34
Compiling rand_core v0.6.4
Compiling siphasher v0.3.11
Compiling pango-sys v0.22.9
Compiling gdk-pixbuf-sys v0.22.9
Compiling cairo-sys-rs v0.22.9
Compiling darling_core v0.24.1
Compiling glib-macros v0.22.9
Compiling futures-executor v0.3.34
Compiling ppv-lite86 v0.2.21
Compiling getrandom v0.1.16
Compiling rand_chacha v0.3.1
Compiling rand v0.8.8
Compiling gdk4-sys v0.11.4
Compiling rustc_version v0.4.1
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Compiling idna_adapter v1.2.2
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Compiling fs-err v3.3.1
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Compiling mac v0.1.1
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Compiling once_cell v1.21.4
Compiling unicode-width v0.2.2
Compiling console v0.16.4
Compiling futf v0.1.5
Compiling tokio v1.53.1
Compiling tauri-utils v3.0.0-alpha.1
Compiling pango v0.22.9
Compiling gdk-pixbuf v0.22.0
Compiling gdk4 v0.11.4
Compiling markup5ever v0.14.1
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Compiling proc-macro-crate v3.5.0
Compiling phf v0.10.1
Compiling selectors v0.24.0
Compiling string_cache v0.8.9
Compiling http-body v1.1.0
Compiling graphene-rs v0.22.8
Compiling phf v0.11.3
Compiling embed-resource v3.0.11
Compiling quick-xml v0.41.0
Compiling cssparser-macros v0.6.1
Compiling scoped-tls v1.0.1
Compiling wayland-client v0.31.15
Compiling convert_case v0.4.0
Compiling sha1_smol v1.0.1
Compiling nodrop v0.1.14
Compiling matches v0.1.10
Compiling downcast-rs v1.2.1
Compiling servo_arc v0.2.0
Compiling download-cef v3.0.0
Compiling wayland-scanner v0.31.11
Compiling derive_more v0.99.20
Compiling gsk4 v0.11.4
Compiling tauri-winres v0.3.6
Compiling gtk4-macros v0.11.4
Compiling phf v0.8.0
Compiling fxhash v0.2.1
Compiling gdk4-wayland-sys v0.11.0
Compiling gdk4-x11-sys v0.11.0
Compiling cargo_toml v1.0.1
Compiling cmake v0.1.58
Compiling uuid v1.26.0
Compiling match_token v0.1.0
Compiling xkeysym v0.2.1
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Compiling cursor-icon v1.2.0
Compiling html5ever v0.29.1
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Compiling tauri-build v3.0.0-alpha.1
Compiling cfb v0.14.0
Compiling cef-dll-sys v152.3.0+152.0.6
Compiling gtk4 v0.11.4
Compiling jsonptr v0.7.1
Compiling polling v3.11.0
Compiling gethostname v1.1.0
Compiling erased-serde v0.4.10
Compiling serde_spanned v1.1.1
Compiling x11rb-protocol v0.13.2
Compiling xcursor v0.3.11
Compiling as-raw-xcb-connection v1.0.1
Compiling hyper v1.11.1
Compiling wayland-protocols v0.32.13
Compiling tower v0.5.3
Compiling serde-untagged v0.1.9
Compiling calloop v0.14.4
Compiling kuchikiki v0.8.8-speedreader
Compiling json-patch v4.2.0
Compiling ico v0.5.0
Compiling tauri v3.0.0-alpha.2
Compiling infer v0.22.0
Compiling winit-common v0.31.0-beta.3
Compiling plist v1.10.1
Compiling png v0.18.1
Compiling x11rb v0.13.2
Compiling muda v0.20.0
Compiling bytemuck v1.25.2
Compiling cfg_aliases v0.2.2
Compiling tauri-winit v0.31.0-beta.3
Compiling tauri-winit-x11 v0.31.0-beta.3
Compiling tokio-util v0.7.19
Compiling hyper-util v0.1.20
Compiling tauri-codegen v3.0.0-alpha.1
Compiling gdk4-x11 v0.11.4
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Compiling tower-http v0.6.11
Compiling http-body-util v0.1.5
Compiling cargo-platform v0.3.3
Compiling serialize-to-javascript v0.1.2
Compiling cargo_metadata v0.23.1
Compiling tauri-runtime v3.0.0-alpha.1
Compiling reqwest v0.13.4
Compiling tauri-winit-gtk4 v0.31.0-beta.3
Compiling tauri-macros v3.0.0-alpha.1
Compiling tauri-runtime-cef v3.0.0-alpha.2 (/home/runner/work/tauri/tauri/target/package/tauri-runtime-cef-3.0.0-alpha.2)
Compiling dirs v6.0.0
Compiling dioxus-debug-cell v0.1.1
Compiling cef v152.3.0+152.0.6
Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 07s
Uploading tauri-runtime-cef v3.0.0-alpha.2 (/home/runner/work/tauri/tauri/crates/tauri-runtime-cef)
Uploaded tauri-runtime-cef v3.0.0-alpha.2 to registry `crates-io`
note: waiting for tauri-runtime-cef v3.0.0-alpha.2 to be available at registry `crates-io`
help: you may press ctrl-c to skip waiting; the crate should be available shortly
Published tauri-runtime-cef v3.0.0-alpha.2 at registry `crates-io`
```
</details>
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