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Advisory record · RUSTSEC-2026-0301

Double free in `StackVec::retain` when a predicate or element `Drop` panics

No CVSS score

Published by OSV at 22 Sept 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
stack_collectionscrates.io>=0.3.0, <0.3.30.3.3
Identifiers
RUSTSEC-2026-0301
Published
22 Sept 2026
Updated
22 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions 0.3.0 up to but not including 0.3.3 of the stack_collections crate are affected. In `StackVec::retain`, if the retain predicate or a removed element's Drop implementation panics, unwinding can leave a duplicated or already-destroyed element in the vector, leading to a double drop and, for heap-owning types, a double free. This only applies to builds with unwinding enabled, not to panic = "abort" builds. Upgrade to stack_collections 0.3.3 or later. No severity is given.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

No source has published a CVSS score for this record yet.

  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.