{"items":[{"id":"NVI-00013826","kind":"vulnerability","title":"NLTK: Corpus Reader Sandbox Bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-3gq4-3j92-5w49","CVE-2026-79674"],"plain_summary":"GitHub lists this reviewed advisory for nltk. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0ba3b1b00f6ec441b6f9e4e288849764"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0ba3b1b00f6ec441b6f9e4e288849764","url":"https://github.com/advisories/GHSA-3gq4-3j92-5w49","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-3gq4-3j92-5w49","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:20:31.767Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0ba3b1b00f6ec441b6f9e4e288849764"],"technology":"nltk","known_exclusions":[],"conditions_summary":"## Summary\n\nNLTK corpus-reader constructors can still reach outside-root file and database reads before the `nltk.pathsec` sandbox boundary is enforced.\n\nThe PoC shows the safe path blocked by `pathsec.open`, then `LinThesaurusCorpusReader` and `PanLexLiteCorpusReader` succeeding in the same process.\n\n## Affected Product\n\n- Product: NLTK\n- Asset / component: `nltk.corpus.reader` constructors\n- Version tested: `3.10.2`\n- Deployment / package / tag: commit `474af1f5a94b1b8d53fc2b6defec3a2ce7633b74` / PyPI `nltk`\n- Environment used for verification: Python 3.13.14\n\n## Vulnerability Details\n\n- Vulnerability class: path sandbox bypass / external control of file path\n- Required privileges: none beyond the ability to supply a corpus root path to a consumer call site\n- Entry point: `LinThesaurusCorpusReader(root)` and `PanLexLiteCorpusReader(root)`\n- Trust boundary crossed: NLTK data-root sandbox enforced by `nltk.pathsec`\n- Root affected functions:\n  - CorpusReader.__init__\n  - [LinThesaurusCorpusReader.__init__](https://github.com/nltk/nltk/blob/474af1f5a94b1b8d53fc2b6defec3a2c","public_affected_ranges":["<= 3.10.2"]}],"null_published_at":"2026-11-02T10:00:37.156Z","source_updated_at":"2026-09-08T16:57:11.000Z","source_disclosed_at":"2026-09-08T16:57:08.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:20:31.767Z"}],"next_cursor":null,"snapshot_revision":"42594"}