---
id: CVE-2021-32810
aliases:
  - RUSTSEC-2021-0093
  - GHSA-pqqp-xmhj-wgcw
title: Data race in crossbeam-deque
summary: Data race in crossbeam-deque
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: crossbeam-deque
product: crossbeam-deque
ecosystem: rust
affected:
  - 'crossbeam-deque >= 0.8.0, < 0.8.1'
patched:
  - crossbeam-deque 0.8.1
published: '2021-07-30'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T18:00:03.406312219Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2021-0093'
references:
  - url: 'https://crates.io/crates/crossbeam-deque'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2021-0093.html'
  - url: >-
      https://github.com/crossbeam-rs/crossbeam/commit/38c07fcf09920532dc928e775d48b629337313ee
  - url: >-
      https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-pqqp-xmhj-wgcw
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-32810'
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZQDIBB7VR3ER52FMSMNJPAWNDO5SITCE
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XFBZWCLG7AGLJO4A7K5IMJVPLSWZ5TJP
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WGB2H35CTZDHOV3VLC5BM6VFGURLLVRP
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VQZIEJQBV3S72BHD5GKJQF3NVYNRV5CF
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3LSN3B43TJSFIOB3QLPBI3RCHRU5BLO
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TFUBWBYCPSSXTJGEAQ67CJUNQJBOCM26
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RRPKBRXCRNGNMVFQPFD4LM3QKPEMBQQR
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OCLMH7B7B2MF55ET4NQNPH7JWISFX4RT
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LCIBFGBSL3JSVJQTNEDEIMZGZF23N2KE
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EW5B2VTDVMJ6B3DA4VLMAMW2GGDCE2BK
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CY5T3FCE4MUYSPKEWICLVJBBODGJ6SZE
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AYBSLIYFANZLCYWOGTIYZUM26TJRH7WU
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AWHNNBJCU4EHA2X5ZAMJMGLDUYS5FEPP
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7EZILHZDRGDPOBQ4KTW3E5PPMKLHGH5N
  - url: 'https://github.com/crossbeam-rs/crossbeam'
tags:
  - osv
  - rust
epss: 0.01907
epssPercentile: 0.7965
ingestedAt: '2026-07-09T18:56:37.322Z'
---

## Overview

In the affected version of this crate, the result of the race condition is that one or more tasks in the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a logical bug.

Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are affected by this issue.

Credits to [@kmaork](https://github.com/kmaork) for discovering, reporting and fixing the bug.

## Affected packages

- `crossbeam-deque >= 0.8.0, < 0.8.1`

## Remediation

Upgrade to a patched release:

- `crossbeam-deque 0.8.1`