CVE-2026-5422: Duplicate Advisory Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-gf7q-q4j7-hp7c
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CVSS 6.8
CWE-23
Published
Advisory Summary

CVE-2026-5422 is a MODERATE (CVSS 6.8) path traversal vulnerability (CWE-23: Relative Path Traversal) affecting Duplicate Advisory libraries in the PyPI ecosystem. The issue involves jupyter server vulnerable to path traversal via incorrect root directory boundary check in _get_os_path(). Remediation is available by upgrading affected packages to version 2.18.2.

CVE-2026-5422 at a Glance

CVE Identifier CVE-2026-5422
GHSA Identifier GHSA-gf7q-q4j7-hp7c
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-23: Relative Path Traversal
Affected Product Duplicate Advisory
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-5422

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

jupyter-server fixed: 2.18.2 
pip install jupyter-server>=2.18.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show jupyter-server

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-5422, inspect your installed packages using pip:

pip show jupyter-server

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.18.2), your application is affected.

Note: The pip show jupyter-server command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-23: Relative Path Traversal, where the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5789-5fc7-67v3. This link is maintained to preserve external references. ### Original Description 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.

CVE-2026-5422 Affected Duplicate Advisory Versions

1 component(s)
Fixed Versions:
2.18.2
Product / Package Ecosystem Affected Versions Fixed Version
jupyter-server
pypi/jupyter-server
PyPI
< 2.18.2
2.18.2

References

NVD — CVE-2026-5422 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5422
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-gf7q-q4j7-hp7c
Duplicate Advisory Source Repository REPOSITORY
https://github.com/jupyter-server/jupyter_server
Duplicate Advisory Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-2532.yaml
huntr.com/bounties/24a36953-6... WEB
https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f
pypi.org/project/jupyter-ser... WEB
https://pypi.org/project/jupyter-server
Security Fix Commit FIX COMMIT
http://github.com/jupyter-server/jupyter_server/commit/0d829f2c35a481c3b24ecbe1e25a6f79954e88f2

Frequently Asked Questions

What is CVE-2026-5422?
CVE-2026-5422 is a security vulnerability in Duplicate Advisory involving Jupyter Server vulnerable to Path Traversal via incorrect root directory boundary check in _get_os_path() under CWE-23: Relative Path Traversal.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to 2.18.2 across affected packages: jupyter-server.
What version fixes CVE-2026-5422?
Upgrading to 2.18.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jupyter-server affected?
Yes, jupyter-server is affected in releases prior to 2.18.2. Upgrade your dependency to 2.18.2 or later.
What is the CVSS score of CVE-2026-5422?
CVE-2026-5422 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-5422?
CVE-2026-5422 is classified under CWE-23: Relative Path Traversal (The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.).
How can I check PyPI dependencies for CVE-2026-5422?
Run the dependency tree command: 'pip show jupyter-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gf7q-q4j7-hp7c",
  "modified" : "2026-07-31T20:20:51Z",
  "published" : "2026-06-02T12:31:26Z",
  "withdrawn" : "2026-07-31T20:20:51Z",
  "aliases" : [ "CVE-2026-5422" ],
  "summary" : "Duplicate Advisory: Jupyter Server vulnerable to Path Traversal via incorrect root directory boundary check in _get_os_path() ",
  "details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-5789-5fc7-67v3. This link is maintained to preserve external references.\n\n### Original Description\nA 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "jupyter-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.18.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-5422"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-gf7q-q4j7-hp7c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jupyter-server/jupyter_server"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-2532.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.com/bounties/24a36953-6490-466f-8cb2-a90d1ca56e0f"
  }, {
    "type" : "WEB",
    "url" : "https://pypi.org/project/jupyter-server"
  }, {
    "type" : "WEB",
    "url" : "http://github.com/jupyter-server/jupyter_server/commit/0d829f2c35a481c3b24ecbe1e25a6f79954e88f2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-23" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-09T22:05:59Z",
    "nvd_published_at" : "2026-06-02T10:16:25Z"
  }
}