{"id":"RUSTSEC-2026-0291","title":"Double free in `OwnedAlloc::drop_in_place` when the contained value's `Drop` panics","summary":"Double free in `OwnedAlloc::drop_in_place` when the contained value's `Drop` panics","severity":"none","vendor":"owned-alloc","product":"owned-alloc","ecosystem":"rust","affected":["owned-alloc >= 0.0.0-0"],"published":"2026-09-09","updated":"2026-09-21","sourceUpdated":"2026-09-21T09:15:02.893165285Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0291","references":[{"url":"https://crates.io/crates/owned-alloc"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0291.html"},{"url":"https://gitlab.com/bzim/owned-alloc/-/issues/1"}],"tags":["osv","rust"],"ingestedAt":"2026-09-21T16:06:16.785Z","slug":"RUSTSEC-2026-0291","body":"## Overview\n\n`OwnedAlloc::drop_in_place` destroys the contained value by hand, then commits\nthe ownership transfer with `mem::forget(self)` — which lives inside `into_raw`\nand so runs only after the destruction. `T::drop` is user code and may panic. If\nit does, the forget is skipped and the still-live `OwnedAlloc` unwinds, whose\ndestructor drops the same `T` a second time and then deallocates. For a `T` that\nowns an allocation, the same block is freed twice — a double free (CWE-415).\nThat destructor also reads the already-destroyed value through\n`Layout::for_value` before deallocating, a use-after-free (CWE-416).\n\n`MaybeUninitAlloc::drop_in_place` delegates to the same function, so both public\nentry points are affected. Storing a value whose `Drop` can panic and calling\neither is enough — no `unsafe` on the caller's side.\n\n## Fix\n\nNo fixed release is available. The crate has had no release since 2018 and the\nmaintainer has not responded to the report, nor to the one on `lockfree`, which\nis published from the same account. `forget_inner` leaks the value instead of\ndestroying it, which is safe.\n\n## Affected packages\n\n- `owned-alloc >= 0.0.0-0`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}