{"items":[{"id":"NVI-00016336","kind":"vulnerability","title":"NLTK: Uncontrolled search path when invoking the Graphviz 'dot' binary","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6hwm-xvph-95vm","CVE-2026-78680"],"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-69124c1a0f0a1576271bf38fb488c966"],"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":[{"kind":"CVSS","as_of":"2026-09-01T20:27:21.000Z","value":"7.8 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-69124c1a0f0a1576271bf38fb488c966"}],"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-69124c1a0f0a1576271bf38fb488c966","url":"https://github.com/advisories/GHSA-6hwm-xvph-95vm","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6hwm-xvph-95vm","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:50.763Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-69124c1a0f0a1576271bf38fb488c966"],"technology":"nltk","known_exclusions":[],"conditions_summary":"Two NLTK sites executed the Graphviz `dot` program by bare name, so process creation resolved it via the search path — and on Windows via the current working directory — rather than a validated absolute location. An attacker who can place a file named `dot` where resolution looks (the CWD on Windows, or a writable/relative entry such as `.` on `PATH`) has their binary executed in place of Graphviz (arbitrary code execution).\n\nAffected (<= 3.10.2):\n- `nltk.parse.dependencygraph.dot2img` — called `find_binary(\"dot\")` but discarded the returned validated path and then ran the bare name `[\"dot\", ...]`, so the validation had no effect.\n- `nltk.translate.api.AlignedSent._repr_svg_` — ran the bare name with no validation at all (IPython SVG rendering).\n\nThis is the same class already fixed for the senna, weka, boxer, malt, repp and hunpos wrappers. `nltk.internals.find_binary` refuses a CWD-relative match for a bare tool name and returns only a trusted absolute path; the fix runs that path in both sites.\n\n---\n\n## Attack demonstration\nCaptured output, not illustrative. A `./dot` that writes a `PWNED` marker, planted in the CWD with `.` prepended to `PATH`.\n\n**The vulnerable behaviour (old ","public_affected_ranges":["<= 3.10.2"]}],"null_published_at":"2026-11-04T10:04:27.933Z","source_updated_at":"2026-09-01T20:27:21.000Z","source_disclosed_at":"2026-09-01T20:27:20.000Z","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":"2026-11-02T02:21:50.763Z"}],"next_cursor":null,"snapshot_revision":"42594"}