Double free in `StackVec::retain` when a predicate or element `Drop` panics
Exploitation and risk
Source statusCISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.
Which CVEs have scores here?
This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.
No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.
osv · RUSTSEC-2026-0301
Published## Summary `StackVec::retain` committed its new length to `self.len` only after its internal loop completed. If the retain predicate or a removed element's `Drop` implementation panicked before the loop finished, unwinding proceeded with `self.len` still equal to the original, pre-retain length, leaving either a duplicated or already-destroyed element inside `0..len`. `StackVec`'s own `Drop` then revisited that slot, causing a double-drop (and for heap-owning types, a double-free). ## Impact Affects `StackVec<T, CAP>::retain` for `T: Drop` types where the predicate or the removed element's destructor can panic, on builds with unwinding enabled (`panic = "unwind"`). `no_std`/`panic = "abort"` builds cannot trigger this, since unwinding never occurs. ## Patch Fixed in 0.3.3 using an unwind-safe backshift guard, matching the approach `alloc::vec::Vec::retain` uses.
- Source published
- 22 Sep 2026 12:00:00 UTC
- Source modified
- 22 Sep 2026 21:00:02 UTC
- Saved here
- 24 Oct 2026 13:19:54 UTC
- Source terms
- OSV · upstream source license applies
Original source record · Cite this exact observation · Complete original publisher JSON
Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.