{"id":"PYSEC-2026-3726","details":"nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(), domains(), categories(), or fileids() methods with the symlink filename.","aliases":["CVE-2026-62383","GHSA-3hhw-38pf-pxj6"],"modified":"2026-08-28T20:30:02.662656980Z","published":"2026-08-22T15:16:17.883Z","references":[{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read"},{"type":"EVIDENCE","url":"https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6"}],"affected":[{"package":{"name":"nltk","ecosystem":"PyPI","purl":"pkg:pypi/nltk"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.0"},{"fixed":"3.10.2"}]}],"versions":["3.10.0","3.10.1"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/nltk/PYSEC-2026-3726.yaml"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}