{"id":"GHSA-rvr2-r3pv-5m4p","summary":"oneshot has potential Use After Free when used asynchronously","details":"There is a race condition that can lead to a use-after-free if a `oneshot::Receiver` is polled but then dropped instead of polled to completion. This could happen if the receiver future was cancelled while receiving, for example by being wrapped in a timeout future or similar.\n\nWhen the `Receiver` is polled (`Future::poll`) it writes a waker to the channel and sets it to the `RECEIVING` state. If the `Receiver` was then dropped (instead of polled to completion), the `Drop` implementation on `Receiver` unconditionally swapped the channel state to `DISCONNECTED` and only after doing so it read back its waker from the heap allocation and dropped it. The problem is that the `DISCONNECTED` state could be observed by the `Sender`, which would lead to it deallocating the channel heap memory. If the `Sender` manage to free the channel before the `Receiver` managed to proceed to dropping the waker, then the `Receiver` would read from the freed channel memory (Use After Free).\n\nThe fix was submitted in https://github.com/faern/oneshot/pull/74 and published as part of `oneshot` version `0.1.12`.","aliases":["RUSTSEC-2026-0005"],"modified":"2026-09-10T03:50:59.065721671Z","published":"2026-01-27T00:59:04Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-01-27T00:59:04Z","nvd_published_at":null,"cwe_ids":["CWE-362","CWE-416"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/faern/oneshot/issues/73"},{"type":"WEB","url":"https://github.com/rustsec/advisory-db/pull/2600"},{"type":"WEB","url":"https://github.com/faern/oneshot/commit/d1a1506010bc48962634807d0dcca682af4f50ba"},{"type":"PACKAGE","url":"https://github.com/faern/oneshot"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0005.html"}],"affected":[{"package":{"name":"oneshot","ecosystem":"crates.io","purl":"pkg:cargo/oneshot"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.1.12"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-rvr2-r3pv-5m4p/GHSA-rvr2-r3pv-5m4p.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}