Is jupyter-server affected by CVE-2026-40934?

PyPI jupyter-server is affected in <2.18.0.

Is CVE-2026-40934 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

medium

CVE-2026-40934

Q: Is CVE-2026-40934 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

PyPI · jupyter-server

Summary

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the secret used to sign authentication cookies is persisted to a static file at ~/.local/share/jupyter/runtime/jupyter_cookie_secret and is never rotated when a user changes their password. After a password r

Severity: medium
EPSS: 0.3% (p22)
Also known as: GHSA-5mrq-x3x5-8v8f, PYSEC-2026-69
Published: 2026-05-05

References

https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-5mrq-x3x5-8v8f

Related advisories

CVE-2026-44727 — critical · PyPI/jupyter-server
CVE-2026-35397 — high · PyPI/jupyter-server
CVE-2026-40110 — high · PyPI/jupyter-server
CVE-2025-61669 — medium · PyPI/jupyter-server

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.