AIKIDO-2026-406075
skiplist is vulnerable to Use-After-Free
63
Medium Risk
This Affects:
skiplistTL;DR
SkipList, SkipMap, and OrderedSkipList free stored elements before they update the tail pointer. If a Drop impl or a user supplied predicate panics, tail still points at freed memory. Later reads of the last element then dereference that pointer through unsafe code, leading to a use-after-free. The fix updates tail and len before running user destructors so a panic no longer leaves freed memory reachable.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and a Drop impl or a user supplied predicate can panic.
Background info
skiplist is vulnerable to Use-After-Free in versions 0.1.0 - 1.1.0.
How to fix this
Upgrade the skiplist library to the patch version.
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