CVE catalog
CVE-2026-5422
A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.p
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 4.86% · Oct 25, 2026
A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip ".." from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | jupyter-server | sid | 2.20.0-3 | vulnerable |
| Debian | jupyter-server | forky | 2.20.0-3 | vulnerable |
| Debian | jupyter-server | trixie | 2.15.0-1 | vulnerable |
| Debian | jupyter-server | bookworm | 1.23.3-1 | vulnerable |
| Cpe | jupyter-server | Not reported | Not reported | vulnerable |
| Cpe | jupyter_server | Not reported | Not reported | unknown |
| PyPI | jupyter-server | Not reported | 2.18.2 | fixed |
| Opensuse | python-jupyter-server | tumbleweed | 2.19.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | jupyter-server | source | sid | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jupyter-server | source | forky | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jupyter-server | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jupyter-server | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| PyPI | jupyter-server | PyPI | Not reported | 2.18.2 | Not reported | PYSEC-2026-2532 | Not reported |
| Opensuse | python-jupyter-server | rpm | tumbleweed | 2.19.0-1.1 | Not reported | OPENSUSE-SU-2026:10972-1 | Not reported |
Notes
[trixie] jupyter-server: Minor issue [bookworm] jupyter-server: Minor issue; _get_os_path startswith(root) sibling-prefix traversal present, revisit with next update
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [jupyter-server]Affected
Details (2)
1.23.3-1· all · bookwormAffected
nvd · jupyter-server · debian · bookworm; nvd · jupyter-server · debian · 12
1.23.3-1· all · bookwormAffected
nvd · jupyter-server · debian · bookworm; nvd · jupyter-server · debian · 12
- [python3-jupyter-server]Affected
Source package: [jupyter-server]
Details (2)
1.23.3-1· all · bookwormAffected
nvd · jupyter-server · debian · bookworm; nvd · jupyter-server · debian · 12
1.23.3-1· all · bookwormAffected
nvd · jupyter-server · debian · bookworm; nvd · jupyter-server · debian · 12
[Debian 13 (Trixie)]
- [jupyter-server]Affected
Details (2)
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
- [python3-jupyter-server]Affected
Source package: [jupyter-server]
Details (2)
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
- [python-jupyter-server-doc]Affected
Source package: [jupyter-server]
Details (2)
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
2.15.0-1· all · trixieAffected
nvd · jupyter-server · debian · 13
[openSUSE Tumbleweed]
- [python313-jupyter-server]Unknown
Source package: [python-jupyter-server]
Details (1)
2.20.0-1.3· noarch · tumbleweedUnknown · Fixed:
2.19.0-1.1Version impact unknown
nvd · python-jupyter-server · opensuse · tumbleweed
- [python313-jupyter-server-test]Unknown
Source package: [python-jupyter-server]
Details (1)
2.20.0-1.3· noarch · tumbleweedUnknown · Fixed:
2.19.0-1.1Version impact unknown
nvd · python-jupyter-server · opensuse · tumbleweed
- [python314-jupyter-server]Unknown
Source package: [python-jupyter-server]
Details (1)
2.20.0-1.3· noarch · tumbleweedUnknown · Fixed:
2.19.0-1.1Version impact unknown
nvd · python-jupyter-server · opensuse · tumbleweed
- [python314-jupyter-server-test]Unknown
Source package: [python-jupyter-server]
Details (1)
2.20.0-1.3· noarch · tumbleweedUnknown · Fixed:
2.19.0-1.1Version impact unknown
nvd · python-jupyter-server · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10972-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-5422]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5422]
- [https://osv.dev/vulnerability/PYSEC-2026-2532]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10972-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-5422]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5422.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]