{"items":[{"id":"NVI-00013913","kind":"vulnerability","title":"NLTK: Allowlisted pickle loaders still permit code execution in current source","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-x99w-6fgc-pmfw","CVE-2026-79657"],"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-046219faac8f54120d3d5bb71512899a"],"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":"EPSS","as_of":"2026-11-04T12:03:12.000Z","value":"1.267%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.6984. Missing scores are unknown.","source_id":"sr-046219faac8f54120d3d5bb71512899a"}],"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-1c4cba8c6f145fee03a1cbdf35939b72","url":"https://github.com/advisories/GHSA-x99w-6fgc-pmfw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-x99w-6fgc-pmfw","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:20:31.767Z"},{"id":"sr-046219faac8f54120d3d5bb71512899a","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-79657","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.069Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1c4cba8c6f145fee03a1cbdf35939b72"],"technology":"nltk","known_exclusions":[],"conditions_summary":"### Summary\n\nThe current source tree still allows arbitrary code execution during supposedly safer allowlisted pickle loading. The allowlist trusts whole module namespaces instead of exact safe globals, so crafted pickles can invoke dangerous in-namespace callables through pickle REDUCE.\n\n### Details\n\n- **Vulnerability type:** Remote code execution via unsafe deserialization\n- **Affected component:** `nltk.picklesec.allowlisted_pickle_load`, `nltk.tokenize.punkt.punkt_pickle_load`, `nltk.parse.transitionparser.TransitionParser.parse`\n- **Affected versions:** Current source `v3.10.0-rc2`; published `3.9.4` was not the claim target for this bypass.\n- **Patched versions:** Not yet patched\n- **Root cause:** Module-prefix allowlists include dangerous callables such as `nltk.tokenize.repp.ReppTokenizer._execute` and `numpy.f2py.crackfortran.myeval`.\n\n`punkt_pickle_load()` allowlists both `nltk.tokenize.punkt` and the whole `nltk.tokenize` namespace, which exposes `ReppTokenizer._execute()` and its `subprocess.Popen(...)` sink during unpickling. `TransitionParser.parse()` uses `allowlisted_pickle_load(..., allowed_modules=(\"numpy\", \"scipy\", \"sklearn\"))`, which permits `numpy.f2py.crackfor","public_affected_ranges":["<= 3.10.2"]}],"null_published_at":"2026-11-06T07:24:11.250Z","source_updated_at":"2026-09-08T16:42:58.000Z","source_disclosed_at":"2026-09-08T16:42:57.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-02T02:20:31.767Z"},{"id":"NVI-00013913","kind":"vulnerability","title":"NLTK: Allowlisted pickle loaders still permit code execution in current source","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-x99w-6fgc-pmfw","CVE-2026-79657"],"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-1c4cba8c6f145fee03a1cbdf35939b72"],"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-1c4cba8c6f145fee03a1cbdf35939b72","url":"https://github.com/advisories/GHSA-x99w-6fgc-pmfw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-x99w-6fgc-pmfw","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:20:31.767Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1c4cba8c6f145fee03a1cbdf35939b72"],"technology":"nltk","known_exclusions":[],"conditions_summary":"### Summary\n\nThe current source tree still allows arbitrary code execution during supposedly safer allowlisted pickle loading. The allowlist trusts whole module namespaces instead of exact safe globals, so crafted pickles can invoke dangerous in-namespace callables through pickle REDUCE.\n\n### Details\n\n- **Vulnerability type:** Remote code execution via unsafe deserialization\n- **Affected component:** `nltk.picklesec.allowlisted_pickle_load`, `nltk.tokenize.punkt.punkt_pickle_load`, `nltk.parse.transitionparser.TransitionParser.parse`\n- **Affected versions:** Current source `v3.10.0-rc2`; published `3.9.4` was not the claim target for this bypass.\n- **Patched versions:** Not yet patched\n- **Root cause:** Module-prefix allowlists include dangerous callables such as `nltk.tokenize.repp.ReppTokenizer._execute` and `numpy.f2py.crackfortran.myeval`.\n\n`punkt_pickle_load()` allowlists both `nltk.tokenize.punkt` and the whole `nltk.tokenize` namespace, which exposes `ReppTokenizer._execute()` and its `subprocess.Popen(...)` sink during unpickling. `TransitionParser.parse()` uses `allowlisted_pickle_load(..., allowed_modules=(\"numpy\", \"scipy\", \"sklearn\"))`, which permits `numpy.f2py.crackfor","public_affected_ranges":["<= 3.10.2"]}],"null_published_at":"2026-11-02T10:00:37.173Z","source_updated_at":"2026-09-08T16:42:58.000Z","source_disclosed_at":"2026-09-08T16:42:57.000Z","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"}