{"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","CWE-22"],"vendor":"nltk","product":"nltk","affected":["nltk < 3.10.0"],"patched":["nltk 3.10.0"],"published":"2026-08-22","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","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://github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-65915.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-65915"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2521343"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-65915"}],"tags":["nvd","ghsa","pip","osv","csaf","vex","red-hat"],"epss":0.0041,"epssPercentile":0.35088,"aliases":["GHSA-72r2-7mfr-5xr9","PYSEC-2026-3731"],"ecosystem":"pip","ingestedAt":"2026-08-23T04:42:15.391Z","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## Affected\n\n- `nltk < 3.10.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `nltk 3.10.0`\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\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat OpenShift AI (RHOAI) · no fix planned: Exploit Intelligence, Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-65915.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}