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Not in CISA KEV
HIGH severity

CVE-2020-36438 — tiny_future

HIGHFix: KizzyCode/tiny_future-rust@c791919

CVE-2020-36438 is a high-severity (CVSS 8.1) CWE-362 vulnerability in tiny_future. A fix is available for tiny_future — see the affected versions and patch details below.

Data race in tiny_future

Also known asGHSA-m296-j53x-xv95RUSTSEC-2020-0118
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs54th percentile — riskier than 54% of all scored CVEsHighest risk
0.00%0.42%0.84%1.27%0.3%0.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-36438 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🦀tiny_future

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit c791919 by adding trait bounds to Future's Send and Sync.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iotiny_futureall versions0.4.0cargo update -p tiny_future --precise 0.4.0

Affected Products

1 product · 1 configurations
Application
tiny futuretiny_future_project
< 0.4.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tiny_future, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update tiny_future to 0.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-36438 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit `c791919` by adding trait bounds to Future's Send and Sync.
O3 Security · Impact-Aware SCA

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CVE-2020-36438: tiny_future — Fixed in 0.4.0