{"id":"CVE-2026-109956","revision":null,"records":[{"revision":"70bd331a81224c078c42a138025a37f5","observedAt":"2026-10-26T20:35:31.018+00:00","statement":{"source":"cve-program","id":"CVE-2026-109956","aliases":[],"title":"NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path","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.","state":0,"publishedAt":"2026-10-13T13:27:20.244+00:00","modifiedAt":"2026-10-26T19:46:30.241+00:00","affected":[{"ecosystem":"Vendor product","name":"nltk","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nltk\",\n                    \"product\": \"nltk\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/nltk\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"3.10.3\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.3,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","score":7,"severity":"HIGH"}],"references":["https://github.com/nltk/nltk/security/advisories/GHSA-j456-xh4h-cpf2","https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-wekaclassifier-model-path"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109956","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109956","identifiers":["CVE-2026-109956"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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