DEBIAN-CVE-2026-40934
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-40934
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40934.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-40934
- Upstream
- Published
- 2026-05-05T22:16:00Z
- Modified
- 2026-09-01T16:06:41Z
- Severity
-
- 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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 reset and server restart, any previously issued authentication cookie remains cryptographically valid because the signing key has not changed. An attacker who has captured a session cookie through any means retains full authenticated access to the server regardless of subsequent password changes. This affects deployments using password-based authentication, particularly shared or public-facing servers where credential rotation is expected to revoke existing sessions. This issue has been fixed in version 2.18.0.
- References
Affected packages
Debian:12 / jupyter-server
Package
- Name
- jupyter-server
- Purl
- pkg:deb/debian/jupyter-server?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / jupyter-server
Package
- Name
- jupyter-server
- Purl
- pkg:deb/debian/jupyter-server?arch=source&distro=trixie
Debian:14 / jupyter-server
Package
- Name
- jupyter-server
- Purl
- pkg:deb/debian/jupyter-server?arch=source&distro=forky