{"cve":"CVE-2026-70626","nvd":{"published":"2026-08-22T15:16:21.100","modified":"2026-10-14T13:10:00.187","status":"Analyzed","description":"NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because path validation is lexical and does not account for symlink resolution, enabling attackers to place symlinks inside the corpus root to access files outside the intended boundary.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":6.2},"cwes":["CWE-59"],"references":["https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9","https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader","https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9"],"products":["nltk:nltk"],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-70626","score":0.002,"percentile":0.09685,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-r6gq-whwq-mvg9","url":"https://osv.dev/vulnerability/GHSA-r6gq-whwq-mvg9","summary":"NLTK: Symlink escape in CorpusReader allows arbitrary local file read outside the corpus root","modified":"2026-09-08T15:30:07.726015360Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.9.4"],"fixed":["3.9.4"]}]},{"id":"PYSEC-2026-3732","url":"https://osv.dev/vulnerability/PYSEC-2026-3732","summary":"","modified":"2026-09-01T09:15:04.067655457Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.9.4"],"fixed":["3.9.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}