{"items":[{"id":"NVI-00013820","kind":"vulnerability","title":"NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8mgp-746c-j5xp","CVE-2026-81726"],"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-263618a09adcc414e5ce0385dd61403c"],"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":"2026-09-02T14:35:05.000Z","value":"7 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0b06a4695643856bc1cfcd814320a16d"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.339%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.27448. Missing scores are unknown.","source_id":"sr-263618a09adcc414e5ce0385dd61403c"}],"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-0b06a4695643856bc1cfcd814320a16d","url":"https://github.com/advisories/GHSA-8mgp-746c-j5xp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8mgp-746c-j5xp","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:43.711Z"},{"id":"sr-263618a09adcc414e5ce0385dd61403c","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-2026-81726","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:45:16.083Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0b06a4695643856bc1cfcd814320a16d"],"technology":"nltk","known_exclusions":[],"conditions_summary":"### Summary\n\nSeveral model-artifact APIs still treat caller-controlled model paths as ordinary filenames even when NLTK path security is enforced. The same outside-root paths are rejected by guarded helpers, but these public read and write flows still use raw file APIs.\n\n### Details\n\n- **Vulnerability type:** File sandbox bypass\n- **Affected component:** `TransitionParser.train`, `TransitionParser.parse`, `AveragedPerceptron.save`, `AveragedPerceptron.load`, `PerceptronTagger.save_to_json`, `save_maxent_params`\n- **Affected versions:** Published `3.9.4` and current source `v3.10.0-rc2` both reproduced.\n- **Patched versions:** Not yet patched\n- **Root cause:** Model import and export helpers use built-in `open()` on caller-controlled paths instead of pathsec-aware helpers.\n\n`TransitionParser.train()` writes outside allowed roots, `TransitionParser.parse()` reads outside allowed roots, `AveragedPerceptron` bypasses the sandbox in both directions, and adjacent read-side helpers in the same family already show the intended guarded behavior. I confirmed outside-root reads and writes while `pathsec.open()` or the guarded sibling helpers rejected the same paths.\n\n### PoC\n\n**Preconditions*","public_affected_ranges":["<= 3.10.3"]}],"null_published_at":"2026-11-08T19:53:33.602Z","source_updated_at":"2026-09-02T14:35:05.000Z","source_disclosed_at":"2026-09-02T14:35:04.000Z","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":"2026-11-02T02:21:43.711Z"},{"id":"NVI-00013820","kind":"vulnerability","title":"NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8mgp-746c-j5xp","CVE-2026-81726"],"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-0b06a4695643856bc1cfcd814320a16d"],"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":"2026-09-02T14:35:05.000Z","value":"7 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0b06a4695643856bc1cfcd814320a16d"}],"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-0b06a4695643856bc1cfcd814320a16d","url":"https://github.com/advisories/GHSA-8mgp-746c-j5xp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8mgp-746c-j5xp","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:43.711Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0b06a4695643856bc1cfcd814320a16d"],"technology":"nltk","known_exclusions":[],"conditions_summary":"### Summary\n\nSeveral model-artifact APIs still treat caller-controlled model paths as ordinary filenames even when NLTK path security is enforced. The same outside-root paths are rejected by guarded helpers, but these public read and write flows still use raw file APIs.\n\n### Details\n\n- **Vulnerability type:** File sandbox bypass\n- **Affected component:** `TransitionParser.train`, `TransitionParser.parse`, `AveragedPerceptron.save`, `AveragedPerceptron.load`, `PerceptronTagger.save_to_json`, `save_maxent_params`\n- **Affected versions:** Published `3.9.4` and current source `v3.10.0-rc2` both reproduced.\n- **Patched versions:** Not yet patched\n- **Root cause:** Model import and export helpers use built-in `open()` on caller-controlled paths instead of pathsec-aware helpers.\n\n`TransitionParser.train()` writes outside allowed roots, `TransitionParser.parse()` reads outside allowed roots, `AveragedPerceptron` bypasses the sandbox in both directions, and adjacent read-side helpers in the same family already show the intended guarded behavior. I confirmed outside-root reads and writes while `pathsec.open()` or the guarded sibling helpers rejected the same paths.\n\n### PoC\n\n**Preconditions*","public_affected_ranges":["<= 3.10.3"]}],"null_published_at":"2026-11-02T10:00:37.155Z","source_updated_at":"2026-09-02T14:35:05.000Z","source_disclosed_at":"2026-09-02T14:35:04.000Z","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":"2026-11-02T02:21:43.711Z"}],"next_cursor":null,"snapshot_revision":"42594"}