{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-86099 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-86099 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86099 is a high-severity path traversal vulnerability in chainlit, published on 9 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-2026-86099 and fix it if it is affected.\n\nWhat it is: CVE-2026-86099 is a high-severity path traversal vulnerability in chainlit, published on 9 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-2026-86099 in the wild and no public exploit code.\n\nAffected product: chainlit. 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-2026-86099/ (Markdown: https://insights.sbomify.com/CVE-2026-86099/index.md)","id":"CVE-2026-86099","markdown":"https://insights.sbomify.com/CVE-2026-86099/index.md","name":"CVE-2026-86099","record":{"aliases":["GHSA-wf68-h55h-fvxv"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Chainlit web framework","requires_auth":"none","summary":"Unauthenticated attackers can exploit path traversal in Chainlit to delete arbitrary directories, causing data loss and service disruption.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and recursively delete arbitrary directories accessible to the service process.","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":"Chainlit through 2.12.0 Path Traversal via socket.io sessionId","id":"CVE-2026-86099","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":"Camaleon CMS 2.7.5 through 2.9.1 SSRF via HTTP Redirect in Upload from URL","id":"CVE-2026-86100"},"packages":[],"prev":{"headline":"ntop nDPI before 6.0 Heap Buffer Overflow via ndpi_json_string_escape","id":"CVE-2026-86098"},"products":["chainlit"],"published":"2026-09-09","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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-09","vendors":["Chainlit"]},"summary":"Unauthenticated attackers can exploit path traversal in Chainlit to delete arbitrary directories, causing data loss and service disruption.","url":"https://insights.sbomify.com/CVE-2026-86099/"}