{"id":"CVE-2026-65915","title":"NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert","summary":"NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-284"],"published":"2026-08-22","updated":"2026-08-22","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65915","references":[{"url":"https://github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nltk-before-arbitrary-file-read-via-filesystempathpointer","label":"disclosure@vulncheck.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65915"},{"url":"https://github.com/nltk/nltk/pull/3522"},{"url":"https://github.com/nltk/nltk/commit/69db9911fdba914ceeaca7aec6e892d1b14586a9"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3731.yaml"},{"url":"https://huntr.com/bounties/a510de7b-ffaf-4a83-9bf8-fa7e63f4bd2d"},{"url":"https://github.com/advisories/GHSA-72r2-7mfr-5xr9"},{"url":"https://github.com/nltk/nltk"}],"tags":["nvd","ghsa","pip","osv"],"ingestedAt":"2026-08-23T04:42:15.391Z","epss":0.00359,"epssPercentile":0.29692,"aliases":["GHSA-72r2-7mfr-5xr9","PYSEC-2026-3731"],"ecosystem":"pip","vendor":"nltk","product":"nltk","affected":["nltk <= 3.9.3"],"patched":["nltk 3.10.0"],"slug":"CVE-2026-65915","body":"## Overview\n\nNLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-65915)\n\nAffected packages:\n\n- `nltk <= 3.9.3`\n\nPatched in:\n\n- `nltk 3.10.0`\n\nSource: https://github.com/advisories/GHSA-72r2-7mfr-5xr9","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}