{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-35031 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-35031 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-35031 is a critical path traversal vulnerability in jellyfin, published on 14 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-35031 and fix it if it is affected.\n\nWhat it is: CVE-2026-35031 is a critical path traversal vulnerability in jellyfin, published on 14 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-35031 in the wild and no public exploit code.\n\nAffected product: jellyfin. 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-2026-35031/ (Markdown: https://insights.sbomify.com/CVE-2026-35031/index.md)","id":"CVE-2026-35031","markdown":"https://insights.sbomify.com/CVE-2026-35031/index.md","name":"CVE-2026-35031","record":{"aliases":["GHSA-j2hf-x4q5-47j3"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Jellyfin media server","requires_auth":"low_privilege","summary":"Attackers with subtitle upload permissions can exploit path traversal to write arbitrary files, leading to remote code execution and privilege escalation.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"jellyfin","vendor":"jellyfin"}],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"},{"id":"CWE-20","name":"Improper Input Validation"},{"id":"CWE-187","name":"Partial String Comparison"}],"description":"Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal via the file extension and enabling arbitrary file write. This arbitrary file write can be chained into arbitrary file read via .strm files, database extraction, admin privilege escalation, and ultimately remote code execution as root via ld.so.preload. Exploitation requires an administrator account or a user that has been explicitly granted the \"Upload Subtitles\" permission. This issue has been fixed in version 10.11.7. If users are unable to upgrade immediately, they can grant non-administrator users Subtitle upload permissions to reduce attack surface.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-04-15","github_poc":1,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-04-15T20:56:49Z","kind":"github_poc","ref":"https://github.com/keraattin/CVE-2026-35031","stars":1,"title":"Critical path traversal to RCE vulnerability in Jellyfin Media Server (CVSS 9.9). Includes proof-of-concept exploit, technical analysis, and detection tools."}],"tier":"poc_unverified"},"has_fix":false,"headline":"Jellyfin: Potential RCE via subtitle upload path traversal + .strm chain","id":"CVE-2026-35031","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Jellyfin: Potential SSRF + Arbitrary file read via LiveTV M3U tuner","id":"CVE-2026-35032"},"packages":[],"prev":{"headline":"LiteLLM has an authentication bypass via OIDC userinfo cache key collision","id":"CVE-2026-35030"},"products":["jellyfin"],"published":"2026-04-14","related":[{"cvss_score":10,"headline":"Jellyfin Possible Organization/Secret Compromise from dangerous CI implementation","id":"CVE-2026-31852","kev_date_added":null,"published":"2026-03-11"},{"cvss_score":9.3,"headline":"Jellyfin: Potential SSRF + Arbitrary file read via stream argument injection","id":"CVE-2026-35033","kev_date_added":null,"published":"2026-04-14"},{"cvss_score":9.1,"headline":"jellyfin-web has a stored cross-site scripting vulnerability in devices.js","id":"CVE-2023-30627","kev_date_added":null,"published":"2023-04-24"},{"cvss_score":8.8,"headline":"Jellyfin vulnerable to directory traversal and file write causing arbitrary code execution","id":"CVE-2023-30626","kev_date_added":null,"published":"2023-04-24"},{"cvss_score":8.8,"headline":"Incorrect Access Control and Cross Site Scripting in Jellyfin","id":"CVE-2022-35909","kev_date_added":null,"published":"2022-08-19"},{"cvss_score":8.6,"headline":"Jellyfin: Potential SSRF + Arbitrary file read via LiveTV M3U tuner","id":"CVE-2026-35032","kev_date_added":null,"published":"2026-04-14"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-16","vendors":["jellyfin"]},"summary":"Attackers with subtitle upload permissions can exploit path traversal to write arbitrary files, leading to remote code execution and privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-35031/"}