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Fedora 43 python-jupytext Important Denial Of Service Fix 2026-31e6b85f4e

fedora
Calendar Grey June 30, 2026
Dist Fedora Esm H88
An important security update for python-jupytext on Fedora 43 addresses critical memory issues and improves performance.
See https://github.com/jupytext/jupytext/releases/tag/v1.19.4 for changes in version 1.19.4

Summary

Have you always wished Jupyter notebooks were plain text documents? Wished

you could edit them in your favorite IDE? And get clear and meaningful diffs

when doing version control? Then... Jupytext may well be the tool you're

looking for!

Jupytext is a plugin for Jupyter that can save Jupyter notebooks as

- Markdown files (or MyST Markdown files, or R Markdown or Quarto text

notebooks)

- Scripts in many languages.

Common use cases for Jupytext are:

- Doing version control on Jupyter Notebooks

- Editing, merging or refactoring notebooks in your favorite text editor

- Applying Q&A checks on notebooks.

Update Information:

See https://github.com/jupytext/jupytext/releases/tag/v1.19.4 for changes in version 1.19.4. Notable, this update fixes CVE-2026-45736 and CVE-2026-48779.

Topics%20covered

Topics Covered

security advisory denial of service fedora important memory exhaustion python-jupytext

Change Log

* Mon Jun 22 2026 Jerry James - 1.19.4-1 - Version 1.19.4

References


[ 1 ] Bug #2489680 - CVE-2026-48779 python-jupytext: ws: Denial of Service via memory exhaustion from small WebSocket fragments [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2489680 [ 2 ] Bug #2491250 - python-jupytext-1.19.4 is available https://bugzilla.redhat.com/show_bug.cgi?id=2491250 [ 3 ] Bug #2491597 - CVE-2026-45736 python-jupytext: ws: Uninitialized memory disclosure via `websocket.close()` with `TypedArray` [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2491597

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-31e6b85f4e' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

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Name: python-jupytext
Product: Fedora 43
Version: 1.19.4
Release: 1.fc43
URL: https://jupytext.org/
Summary: Save Jupyter notebooks as text documents or scripts

Topics%20covered

Topics Covered

security advisory denial of service fedora important memory exhaustion python-jupytext

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