{"answers":{"affected":"2 open source packages ship an affected version, including nltk.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109956 exists.","fix":"Upgrade nltk to 3.10.4 or later.","what":"CVE-2026-109956 is a high-severity path traversal vulnerability in nltk, published on 13 Oct 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-2026-109956 and fix it if it is affected.\n\nWhat it is: CVE-2026-109956 is a high-severity path traversal vulnerability in nltk, published on 13 Oct 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-2026-109956 exists.\n\nAffected packages and fixed versions:\n- nltk (PyPI): affected all versions; fixed in 3.10.4\n- nltk (PyPI): affected all versions; fixed in 3.10.4\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-2026-109956/ (Markdown: https://insights.sbomify.com/CVE-2026-109956/index.md)","id":"CVE-2026-109956","markdown":"https://insights.sbomify.com/CVE-2026-109956/index.md","name":"CVE-2026-109956","record":{"aliases":["DEBIAN-CVE-2026-109956","ECHO-d53c-5278-1d0e","GHSA-9fgx-q9j8-3j83","GHSA-j456-xh4h-cpf2","UBUNTU-CVE-2026-109956"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Python NLP library","requires_auth":"none","summary":"Attackers can bypass path restrictions in NLTK's WekaClassifier to read or write files outside allowed directories via unvalidated model paths.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows attackers to bypass nltk.pathsec containment by supplying unvalidated model paths. Attackers controlling the model_filename or model argument can make the weka JVM write files via -d or probe files via -l outside allowed data roots.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path","id":"CVE-2026-109956","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"EspoCRM before 10.0.7 IDOR via Import attachmentId Parameter","id":"CVE-2026-109957"},"packages":[{"ecosystem":"PyPI","fixed":["3.10.4"],"introduced":["0"],"last_affected":[],"package":"nltk","purl":null,"source":"GHSA-j456-xh4h-cpf2"},{"ecosystem":"PyPI","fixed":["3.10.4"],"introduced":["0"],"last_affected":[],"package":"nltk","purl":"pkg:pypi/nltk","source":"GHSA-j456-xh4h-cpf2"}],"prev":{"headline":"Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding","id":"CVE-2026-109955"},"products":["nltk"],"published":"2026-10-13","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-26","vendors":["nltk"]},"summary":"Attackers can bypass path restrictions in NLTK's WekaClassifier to read or write files outside allowed directories via unvalidated model paths.","url":"https://insights.sbomify.com/CVE-2026-109956/"}