{"answers":{"affected":"3 open source packages ship an affected version, including langflow. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42867 exists.","fix":"Upgrade langflow to 1.9.0 or later.","what":"CVE-2026-42867 is a medium-severity path traversal vulnerability in Langflow Langflow, published on 23 Jun 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-2026-42867 and fix it if it is affected.\n\nWhat it is: CVE-2026-42867 is a medium-severity path traversal vulnerability in Langflow Langflow, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42867 exists.\n\nAffected packages and fixed versions:\n- langflow (PyPI): affected all versions; fixed in 1.9.0\n- langflow (PyPI): affected all versions; fixed in 1.9.0\n- langflow (PyPI): affected all versions; fixed in 1.9.0\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-2026-42867/ (Markdown: https://insights.sbomify.com/CVE-2026-42867/index.md)","id":"CVE-2026-42867","markdown":"https://insights.sbomify.com/CVE-2026-42867/index.md","name":"CVE-2026-42867","record":{"aliases":["GHSA-79ph-745m-6wxq","PYSEC-2026-2566"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"AI workflow builder","requires_auth":"none","summary":"An authenticated attacker can exploit a path traversal flaw in the Knowledge Bases API to write arbitrary files to the server filesystem.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"langflow","vendor":"langflow"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Langflow: Path Traversal in Knowledge Bases API via Creation Endpoint","id":"CVE-2026-42867","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"langflow:langflow","products":["langflow:langflow"],"type":"path_traversal","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Hardcoded credentials in CoPilot","id":"CVE-2026-42869"},"packages":[{"ecosystem":"PyPI","fixed":["1.9.0"],"introduced":["0"],"last_affected":[],"package":"langflow","purl":null,"source":"GHSA-79ph-745m-6wxq"},{"ecosystem":"PyPI","fixed":["1.9.0"],"introduced":["0"],"last_affected":[],"package":"langflow","purl":"pkg:pypi/langflow","source":"GHSA-79ph-745m-6wxq"},{"ecosystem":"PyPI","fixed":["1.9.0"],"introduced":["0"],"last_affected":[],"package":"langflow","purl":"pkg:pypi/langflow","source":"PYSEC-2026-2566"}],"prev":{"headline":"Tookie: Arbitrary file write via path traversal in -u username / -U userfile output filename","id":"CVE-2026-42866"},"products":["langflow"],"published":"2026-06-23","related":[{"cvss_score":9.8,"headline":"IBM Langflow Code Injection","id":"CVE-2026-9198","kev_date_added":"2026-08-04","published":"2026-07-17"},{"cvss_score":9.8,"headline":"Langflow Inclusion of Functionality from Untrusted Control Sphere","id":"CVE-2026-0770","kev_date_added":"2026-07-21","published":"2026-01-23"},{"cvss_score":9.8,"headline":"Langflow Missing Authentication","id":"CVE-2025-3248","kev_date_added":"2025-05-05","published":"2025-04-07"},{"cvss_score":9.4,"headline":"Langflow Origin Validation Error","id":"CVE-2025-34291","kev_date_added":"2026-05-21","published":"2025-12-05"},{"cvss_score":9.3,"headline":"Langflow Code Injection","id":"CVE-2026-33017","kev_date_added":"2026-03-25","published":"2026-03-20"},{"cvss_score":8.4,"headline":"Langflow Authorization Bypass Through User-Controlled Key","id":"CVE-2026-55255","kev_date_added":"2026-07-07","published":"2026-06-23"},{"cvss_score":10,"headline":"Unauthenticated Server-Side RCE via PythonCodeStructuredTool in Public Flows","id":"CVE-2026-10134","kev_date_added":null,"published":"2026-06-30"}],"sources":[{"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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-23","vendors":["langflow-ai"]},"summary":"An authenticated attacker can exploit a path traversal flaw in the Knowledge Bases API to write arbitrary files to the server filesystem.","url":"https://insights.sbomify.com/CVE-2026-42867/"}