{"answers":{"affected":"4 open source packages ship an affected version, including jupyterhub. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33709 in the wild and no public exploit code.","fix":"Upgrade jupyterhub to 5.4.4 or later.","what":"CVE-2026-33709 is a medium-severity vulnerability in jupyterhub, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-33709 and fix it if it is affected.\n\nWhat it is: CVE-2026-33709 is a medium-severity vulnerability in jupyterhub, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-33709 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- jupyterhub (Bitnami): affected all versions; fixed in 5.4.4\n- jupyterhub (PyPI): affected all versions; fixed in 5.4.4\n- jupyterhub (PyPI): affected all versions; fixed in 5.4.4\n- jupyterhub (PyPI): affected all versions; fixed in 5.4.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33709/ (Markdown: https://insights.sbomify.com/CVE-2026-33709/index.md)","id":"CVE-2026-33709","markdown":"https://insights.sbomify.com/CVE-2026-33709/index.md","name":"CVE-2026-33709","record":{"aliases":["BIT-jupyterhub-2026-33709","DEBIAN-CVE-2026-33709","GHSA-3vff-hjqv-m7h8","PYSEC-2026-2188","UBUNTU-CVE-2026-33709"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JupyterHub","requires_auth":"none","summary":"Attackers can craft links that redirect users to malicious sites after login, bypassing JupyterHub's security checks.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"jupyterhub","vendor":"jupyter"}],"cvss":{"score":5.1,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this. This issue has been patched in version 5.4.4.","ecosystems":["Bitnami","PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"JupyterHub has an Open Redirect Vulnerability","id":"CVE-2026-33709","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"open_redirect","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"Chamilo LMS has Weak REST API Key Generation (Predictable)","id":"CVE-2026-33710"},"packages":[{"ecosystem":"Bitnami","fixed":["5.4.4"],"introduced":["0"],"last_affected":[],"package":"jupyterhub","purl":"pkg:bitnami/jupyterhub","source":"BIT-jupyterhub-2026-33709"},{"ecosystem":"PyPI","fixed":["5.4.4"],"introduced":["0"],"last_affected":[],"package":"jupyterhub","purl":null,"source":"GHSA-3vff-hjqv-m7h8"},{"ecosystem":"PyPI","fixed":["5.4.4"],"introduced":["0"],"last_affected":[],"package":"jupyterhub","purl":"pkg:pypi/jupyterhub","source":"GHSA-3vff-hjqv-m7h8"},{"ecosystem":"PyPI","fixed":["5.4.4"],"introduced":["0"],"last_affected":[],"package":"jupyterhub","purl":"pkg:pypi/jupyterhub","source":"PYSEC-2026-2188"}],"prev":{"headline":"Chamilo LMS has REST API PII Exposure via get_user_info_from_username","id":"CVE-2026-33708"},"products":["jupyterhub"],"published":"2026-04-03","related":[{"cvss_score":8.1,"headline":"XSS in JupyterHub via Self-XSS leveraged by Cookie Tossing","id":"CVE-2024-28233","kev_date_added":null,"published":"2024-03-27"},{"cvss_score":7.2,"headline":"JupyterHub has a privilege escalation vulnerability with the `admin:users` scope","id":"CVE-2024-41942","kev_date_added":null,"published":"2024-08-08"},{"cvss_score":6.1,"headline":"Open Redirect vulnerability in jupyterhub and notebook","id":"CVE-2019-10255","kev_date_added":null,"published":"2019-03-28"},{"cvss_score":5.4,"headline":"JupyterHub: Cross-origin form POSTs bypass XSRF","id":"CVE-2026-40864","kev_date_added":null,"published":"2026-05-22"},{"cvss_score":4.5,"headline":"Cross-Site Request Forgery in JupyterHub","id":"CVE-2020-36191","kev_date_added":null,"published":"2021-01-13"},{"cvss_score":3.5,"headline":"incomplete logout in JupyterHub","id":"CVE-2021-41247","kev_date_added":null,"published":"2021-11-04"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-06","vendors":["jupyterhub"]},"summary":"Attackers can craft links that redirect users to malicious sites after login, bypassing JupyterHub's security checks.","url":"https://insights.sbomify.com/CVE-2026-33709/"}