JupyterLab

4.5.7

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Security patches

The details of advisories are under embargo until JupyterLab and Notebook releases land on supported distribution channels.

• CVE-2026-42557 https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-mqcg-5x36-vfcg
• CVE-2026-42266 https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4
• CVE-2026-40171 https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9

Bugs fixed

• Video and Audio Content Providers: Fix JupyterLite support #18652 (@martinRenou)
• Fix notebook hang when dropping cells #18808 (@MUFFANUJ)
• Fix Contextual Help keyboard shortcut reliability and menu Help functionality #18747 (@itsmejay80)
• Fix focusing input element when opening a dialog from Command Palette #18735 (@Carreau)
• Fix native context menu blocked even when context menu is suppressed #18753 (@utsav-develops)
• Fix flaky toolbar item placement in popup #18618 (@filipeoliveira05)
• Update terminal default font family to honor macOS system-wide ui-monospace #18647 (@flaviomartins)

Maintenance and upkeep improvements

• Fix linting issue #18819 (@krassowski)
• Fix syntax for Python 3.9 on 4.5.x branch #18817 (@krassowski)
• Remove unused CodeMirror v5 CSS rule #18785 (@Carreau)
• Remove unused CSS rule forgotten after CodeMirror migration #18763 (@Carreau)
• Remove unused progress bar CSS rule in execution indicator #18759 (@Carreau)
• Remove dead .jp-VariableRenderer-TrustButton CSS rule #18762 (@Carreau)
• Remove used .jp-Cell-Placeholder CSS rules #18761 (@Carreau)

Documentation improvements

• Fix name of option for extension manager implementation in docs #18788 (@krassowski)
• Remove 4.5.0 announcement from docs #18740 (@krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@Carreau (activity) | @filipeoliveira05 (activity) | @flaviomartins (activity) | @itsmejay80 (activity) | @jtpio (activity) | @krassowski (activity) | @martinRenou (activity) | @MUFFANUJ (activity) | @utsav-develops (activity)

4.5.6

(Full Changelog)

Bugs fixed

• Replace scrollback implementation with scroll anchoring outside of full windowing mode #18522 (@krassowski)
• Harmonize translation wrappers in Python files to use gettext methods #18597 (@tmetzl)
• Remove unimplemented filebrowser:search command #18593 (@krassowski)
• Fix status bar focus outlines #18585 (@IsabelParedes)
• Fix filebrowser:create-new-file context menu selector #18588 (@jtpio)
• Fix single-character code blocks rendering as empty #18572 (@soniya-malviy)
• Hide code input in CodeConsole when configured #18554 (@agriyakhetarpal)

Maintenance and upkeep improvements

• Update benchmark snapshots even if base snapshots require changes #18549 (@krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@agriyakhetarpal (activity) | @IsabelParedes (activity) | @jtpio (activity) | @krassowski (activity) | @soniya-malviy (activity) | @tmetzl (activity)

4.5.5

(Full Changelog)

Bugs fixed

• Fix theme settings broken in non-English locales #18530 (@apoorvdarshan)
• Fix comms subshell resource management on disposal and when changing settings #18531 (@krassowski)
• Upgrade @codemirror/view, fixing slow selection when line wrapping is enabled #18479 (@krassowski)
• Only turn off overflow anchor when windowing is active #18503 (@jasongrout)
• Fix table of contents navigation for Markdown files #18411 (@itsmevichu)

Maintenance and upkeep improvements

• Update to marked 17.0.2 and mermaid 11.12.3 #18532 (@bollwyvl, @krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@apoorvdarshan (activity) | @bollwyvl (activity) | @itsmevichu (activity) | @jasongrout (activity) | @krassowski (activity)

4.5.4

(Full Changelog)

Bugs fixed

• Avoid using system clipboard in Notebook widget #18474 (@brichet)
• Update CodeMirror versions, fixing a few selection issues #18466 (@krassowski)
• Fix debugger variable panel to render value 0 properly #18464 (@itsmevichu)
• Consider both the content type and pattern match in DocumentRegistry.getFileTypeForModel() #18409 (@krassowski)
• false in saveAs to avoid fetching file body #18379 (@DeborahOlaboye)

Maintenance and upkeep improvements

• Bump Lumino packages to the 2026.2.5 release, fixing iframe resizing #18440 (@jasongrout)

Documentation improvements

• Clarify notebook and cell metadata API changes in JupyterLab 4 #18304 (@Krish-876)
• Document a change in the Code Editor source updates via sharedModel in JupyterLab 4 #18260 (@Krish-876)
• Fix Contents API fetch documentation of the content default #18383 (@ceasermikes002)
• Add AI rules #18322 (@jtpio)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@brichet (activity) | @ceasermikes002 (activity) | @DeborahOlaboye (activity) | @itsmevichu (activity) | @jasongrout (activity) | @jtpio (activity) | @krassowski (activity) | @Krish-876 (activity)

4.5.3

(Full Changelog)

Bugs fixed

• Fix error in console when the debugger switch from a module to another #18352 (@brichet)
• Fix focus of replace buttons in the document search box #18362 (@IsabelParedes)
• Update CodeMirror to latest versions #18344 (@krassowski)
• Fix deferred cell loading in defer and contentVisibility windowing mode #18359 (@krassowski)
• Backport PR #18349: Fix "Open With > Editor" for .py files, update @lumino packages to v2026.1.15 #18351 (@krassowski, @aaron-seq)

Maintenance and upkeep improvements

• Fix UI tests: config useSystemClipboardForCells=true for notebook toolbar test #18335 (@brichet)
• Remove generated docs files from the repo #18340 (@jtpio)

Documentation improvements

• Add installation instructions for JupyterLab with uv #18363 (@jimangel)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@aaron-seq (activity) | @brichet (activity) | @IsabelParedes (activity) | @jimangel (activity) | @jtpio (activity) | @krassowski (activity)