Vulnerability-Lookup

FKIE_CVE-2026-35397

Vulnerability from fkie_nvd - Published: 2026-05-05 20:16 - Updated: 2026-08-28 16:17

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

Summary

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured root_dir and access sibling directories whose names begin with the same prefix as the root_dir. For example, with a root_dir named "test", the API permits access to a sibling directory named "testtest" through a crafted request to the /api/contents endpoint using encoded path components. An attacker can read, write, and delete files in affected sibling directories. Multi-tenant deployments using predictable naming schemes are particularly at risk, as a user with a directory named "user1" could access directories for user10 through user19 and beyond. A user who can choose a single-character folder name could gain access to a significant number of sibling directories. Version 2.18.0 contains a fix. As a workaround, ensure folder names do not share a common prefix with any sibling directory.

References

URL	Tags
security-advisories@github.com	https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-5789-5fc7-67v3	Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:43038
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:60520
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-35397
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2466858
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-5789-5fc7-67v3	Exploit, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35397.json

Impacted products

	Vendor	Product	Version
	jupyter	jupyter_server	*

JSON

To clipboard

{
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          "product": "jupyter_server",
          "vendor": "jupyter-server",
          "versions": [
            {
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              "version": "\u003c 2.18.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
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    {
      "affectedData": [
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          "defaultStatus": "affected",
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          "vendor": "Red Hat"
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          "vendor": "Red Hat"
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          "vendor": "Red Hat"
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    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:jupyter:jupyter_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E0B6C703-7E28-4F23-9878-E157975C32A4",
              "versionEndExcluding": "2.18.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured root_dir and access sibling directories whose names begin with the same prefix as the root_dir. For example, with a root_dir named \"test\", the API permits access to a sibling directory named \"testtest\" through a crafted request to the /api/contents endpoint using encoded path components. An attacker can read, write, and delete files in affected sibling directories. Multi-tenant deployments using predictable naming schemes are particularly at risk, as a user with a directory named \"user1\" could access directories for user10 through user19 and beyond. A user who can choose a single-character folder name could gain access to a significant number of sibling directories. \n\nVersion 2.18.0 contains a fix. As a workaround, ensure folder names do not share a common prefix with any sibling directory."
    },
    {
      "lang": "es",
      "value": "Jupyter Server es el backend para las aplicaciones web de Jupyter. En las versiones 2.17.0 y anteriores, una vulnerabilidad de salto de ruta en la API REST permite a un usuario autenticado escapar del \u0027root_dir\u0027 configurado y acceder a directorios hermanos cuyos nombres comienzan con el mismo prefijo que el \u0027root_dir\u0027. Por ejemplo, con un \u0027root_dir\u0027 llamado  test , la API permite el acceso a un directorio hermano llamado  testtest  a trav\u00e9s de una solicitud manipulada al endpoint \u0027/api/contents\u0027 utilizando componentes de ruta codificados. Un atacante puede leer, escribir y eliminar archivos en los directorios hermanos afectados. Las implementaciones multi-inquilino que utilizan esquemas de nombres predecibles est\u00e1n particularmente en riesgo, ya que un usuario con un directorio llamado  user1  podr\u00eda acceder a los directorios de user10 a user19 y m\u00e1s all\u00e1. Un usuario que puede elegir un nombre de carpeta de un solo car\u00e1cter podr\u00eda obtener acceso a un n\u00famero significativo de directorios hermanos.\n\nLa versi\u00f3n 2.18.0 contiene una correcci\u00f3n. Como soluci\u00f3n alternativa, aseg\u00farese de que los nombres de las carpetas no compartan un prefijo com\u00fan con ning\u00fan directorio hermano."
    }
  ],
  "id": "CVE-2026-35397",
  "lastModified": "2026-08-28T16:17:45.870",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
          "version": "3.1"
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        "impactScore": 5.5,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
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    "cvssMetricV40": [
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        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.6,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
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    "ssvcV203": [
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            {
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          "timestamp": "2026-05-06T00:00:00+00:00",
          "version": "2.0.3"
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35397.json"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-22"
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      "source": "security-advisories@github.com",
      "type": "Secondary"
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          "value": "CWE-22"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
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  ]
}

CVE-2026-35397 (GCVE-0-2026-35397)

Vulnerability from cvelistv5 – Published: 2026-05-05 19:37 – Updated: 2026-08-28 12:04

Title

jupyter-server path traversal allows access to sibling directories sharing root_dir name prefix

Summary

Severity

7.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-06 00:00 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/jupyter-server/jupyter_server/…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-35397	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2466858	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:43038	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:60520	vendor-advisoryx_refsource_REDHAT

Impacted products

15 products

Vendor	Product	Version
jupyter-server	jupyter_server	Affected: < 2.18.0
Red Hat	Red Hat Migration Toolkit for Applications 8.2	Unaffected: 1784109883 , < * (rpm) cpe:/a:redhat:migration_toolkit_applications:8.2::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787076778 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787077779 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787076481 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787074331 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073913 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787074078 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073929 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073605 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073546 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073717 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073713 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI 3.4	Unaffected: 1787073593 , < * (rpm) cpe:/a:redhat:openshift_ai:3.4::el9
Red Hat	Red Hat OpenShift AI (RHOAI)	cpe:/a:redhat:openshift_ai

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.