{"items":[{"id":"NVI-00020076","kind":"vulnerability","title":"PyO3 has an Out-of-bounds Read in `nth` / `nth_back` for `PyList` and `PyTuple` iterators","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-36hh-v3qg-5jq4"],"plain_summary":"GitHub lists this reviewed advisory for pyo3. 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-731b4929bb5d6b2f8770d9c3cf7838ad"],"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-731b4929bb5d6b2f8770d9c3cf7838ad","url":"https://github.com/advisories/GHSA-36hh-v3qg-5jq4","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-36hh-v3qg-5jq4","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T15:12:54.193Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-731b4929bb5d6b2f8770d9c3cf7838ad"],"technology":"pyo3","known_exclusions":[],"conditions_summary":"PyO3 0.24.0 added optimized implementations of `Iterator::nth` and `DoubleEndedIterator::nth_back` for the `BoundListIterator` and `BoundTupleIterator` types. These implementations computed the target index using unchecked `usize` addition (`index + n`) before bounds-checking against the sequence length, then read the element via `get_item_unchecked`.\n\nIn `nth` methods, a sufficiently large `n` (combined with a non-zero internal index) could cause the addition to overflow and wrap around, producing a small \"target index\" that passed the bounds check and enabling reads at the front of the `list` or `tuple` of elements previously yielded by the iterator.\n\nIn `nth_back` methods, a sufficiently large `n` could cause underflow in a similar fashion, however would instead allow reads of arbitrary memory past the end of the `list` or `tuple` storage.","public_affected_ranges":["< 0.29.0"]}],"null_published_at":"2026-11-08T15:11:47.522Z","source_updated_at":"2026-06-12T19:32:49.000Z","source_disclosed_at":"2026-06-12T19:32:47.000Z","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":"2026-11-06T15:12:54.193Z"}],"next_cursor":null,"snapshot_revision":"42594"}