{"items":[{"id":"NVI-00018616","kind":"vulnerability","title":"unbounded-spsc: Sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6m57-8r3p-pqx6","CVE-2026-46690"],"plain_summary":"GitHub lists this reviewed advisory for unbounded-spsc. 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-44d39351a975c5e48084ef4b2222fa4f"],"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":"2026-06-12T19:31:17.000Z","value":"5.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-44d39351a975c5e48084ef4b2222fa4f"}],"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-44d39351a975c5e48084ef4b2222fa4f","url":"https://github.com/advisories/GHSA-6m57-8r3p-pqx6","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6m57-8r3p-pqx6","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T15:12:54.193Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-44d39351a975c5e48084ef4b2222fa4f"],"technology":"unbounded-spsc","known_exclusions":[],"conditions_summary":"## Summary\n\n`Sender::send` in `src/lib.rs` contains an `unsafe` block in the `DISCONNECTED` arm that transmutes a **raw pointer** (`*mut Producer`) into the bytes of a **value-level** `Consumer`. The author's intent, visible in the surrounding comment at lines 386-390, was a value transmute. The shipped code is one level of indirection off.\n\nThe resulting `Consumer` has its internal `Arc::ptr` set to the address of the `producer` field on the `Sender`, not the real `ArcInner>`. Every subsequent `consumer.try_pop()` walks `Buffer` fields at offsets that lie inside the `Sender` struct (over `send_new`, `inner`) and adjacent memory, an out-of-bounds read. When the fake `Consumer` is dropped at the end of the `unsafe` block, its `Drop` calls `Arc::drop_in_place` on a non-`ArcInner` address: it decrements bytes that the type system treats as `strong_count: AtomicUsize` but that are actually the real `Arc::ptr` value of the `Sender`, and at zero count it calls `dealloc(Layout::for_value(...))` on an address the allocator never returned.\n\nReachable from 100% safe Rust through the canonical channel pattern: a `tx.send(msg)` that races with `rx.drop()`. This is c","public_affected_ranges":["<= 0.2.0"]}],"null_published_at":"2026-11-07T07:07:39.863Z","source_updated_at":"2026-06-12T19:31:17.000Z","source_disclosed_at":"2026-05-29T19:05:21.000Z","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"}