{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-86258 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-86258 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86258 is a high-severity path traversal vulnerability in jupyter nbviewer, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-86258 and fix it if it is affected.\n\nWhat it is: CVE-2026-86258 is a high-severity path traversal vulnerability in jupyter nbviewer, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-86258 in the wild and no public exploit code.\n\nAffected product: jupyter nbviewer. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-86258/ (Markdown: https://insights.sbomify.com/CVE-2026-86258/index.md)","id":"CVE-2026-86258","markdown":"https://insights.sbomify.com/CVE-2026-86258/index.md","name":"CVE-2026-86258","record":{"aliases":["GHSA-v7gx-3h93-r9v6"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Jupyter nbviewer","requires_auth":"none","summary":"Attackers can read files from sibling directories outside the configured root in Jupyter nbviewer, disclosing unintended notebooks and credentials.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"nbviewer through 1.0.1 contains a path traversal vulnerability in LocalFileHandler.can_show() that uses string-prefix comparison instead of proper path validation. Attackers can read files from sibling directories outside the configured root by requesting paths that share the root as a textual prefix, disclosing unintended notebooks and credentials.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"nbviewer through 1.0.1 Path Traversal via LocalFileHandler","id":"CVE-2026-86258","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation","id":"CVE-2026-86259"},"packages":[],"prev":{"headline":"wger before 2.6 CSV Formula Injection via member export","id":"CVE-2026-86257"},"products":["nbviewer"],"published":"2026-09-06","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-09-24","vendors":["jupyter"]},"summary":"Attackers can read files from sibling directories outside the configured root in Jupyter nbviewer, disclosing unintended notebooks and credentials.","url":"https://insights.sbomify.com/CVE-2026-86258/"}