Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Unrated

Use-after-free in clear and retain when an element's Drop panics

GHSA-x6j6-3ffp-qrfr

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (skiplist 1.1.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • crates.io skiplist

    Affected
    >= 0.0.0-0, < 1.1.1
    Fixed in
    1.1.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

`SkipList::clear` drops the node chain and only then resets `tail` and `len`. The drop runs each element's `Drop`, and `T` carries no bounds excluding a panicking one. If it unwinds, `tail` still points at the freed node while `len` stays non-zero. `back()`, `back_mut()`, `last_key_value()` and `last()` dereference `tail` through `unsafe`, so reading the container after the unwind is a use-after-free (CWE-416). `Drop for SkipList` calls `Box::from_raw` on `self.head`, which `clear` already destroyed, so dropping the container is a double free (CWE-415). `retain`, `retain_mut` and `dedup_by` reach the same state through `Node::filter_rebuild`, which frees nodes and runs a user predicate before the caller commits `tail` and `len`. There the head links are left partially rewired, so traversal can also reach freed nodes.

Mitigation Update to 1.1.1.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record RUSTSEC-2026-0300

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-x6j6-3ffp-qrfr

Advisory: Use-after-free in `clear` and `retain` when an element's `Drop` panics
IDs: GHSA-x6j6-3ffp-qrfr
Record: https://patchnext.com/advisories/rustsec-2026-0300 (revision 1, source checked 23 Oct 2026, 22:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: skiplist 1.1.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io skiplist: affected >= 0.0.0-0, < 1.1.1; fixed in 1.1.1

## Suggested inspection (read-only)
- crates.io skiplist: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on skiplist.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/RUSTSEC-2026-0300 (OSV record RUSTSEC-2026-0300 lists affected ranges: crates.io skiplist >=0.0.0-0 <1.1.1 (fixed))

Commands are suggestions: review each one before running it.

Loading voting…