{"cve":"CVE-2026-79676","nvd":{"published":"2026-08-25T16:17:28.177","modified":"2026-08-31T19:06:13.443","status":"Analyzed","description":"NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-22"],"references":["https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr","https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass","https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr"],"products":["nltk:nltk"],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-79676","score":0.00447,"percentile":0.38876,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p4rw-rvv2-7xwr","url":"https://osv.dev/vulnerability/GHSA-p4rw-rvv2-7xwr","summary":"NLTK: Corpus readers follow symlinks outside trusted roots despite pathsec enforcement","modified":"2026-09-08T17:00:04.101709807Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.10.3"],"fixed":["3.10.3"]}]},{"id":"PYSEC-2026-3737","url":"https://osv.dev/vulnerability/PYSEC-2026-3737","summary":"","modified":"2026-09-01T09:15:04.069150741Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.10.3"],"fixed":["3.10.3"]}]}],"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."]}