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CVE-2020-35906 — Vulnerability in futures-task — CVE Details

HIGH

futures_task::waker may cause a use-after-free if used on a type that isn't 'static

Published May 24, 2022Updated October 30, 2025Source: osv

Summary

Affected versions of the crate did not properly implement a 'static lifetime bound on the waker function. This resulted in a use-after-free if Waker::wake() is called after original data had been dropped. The flaw was corrected by adding 'static lifetime bound to the data waker takes.

Advisory Timeline

  • First published May 24, 2022 (1602 days ago).
  • Last revised October 30, 2025 — 1255 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update futures-task to 0.3.6 or later
cargo update -p futures-task --precise 0.3.6

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
futures-task
crates.io
All versions0.3.6

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.8 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2020-35906?
futures_task::waker may cause a use-after-free if used on a type that isn't 'static This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.8/10).
How do I check if my project is affected by CVE-2020-35906?
CVE-2020-35906 affects futures-task. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2020-35906 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-r93v-9p5q-vhpf
RUSTSEC-2020-0060

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