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RUSTSEC-2026-0221: event-listener allows !Send tags to cross thread boundaries via StackSlot #35
Description
event-listenerallows!Sendtags to cross thread boundaries viaStackSlot
| Details | |
|---|---|
| Status | unsound |
| Package | event-listener |
| Version | 5.4.1 |
| URL | smol-rs/event-listener#163 |
| Date | 2026-07-13 |
Affected versions of event-listener unconditionally implement Send and
Sync for StackSlot<'_, T>, the stack-allocated listener type created
by the listener! macro.
This allows a !Send tag type set via Event::with_tag to be moved to
another thread and accessed via StackSlot::wait, causing a data race in safe
code.
See advisory page for additional details.
Activity