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HIGH severity

CVE-2020-36463 — multiqueue

HIGH

CVE-2020-36463 is a high-severity (CVSS 8.1) CWE-77 vulnerability in multiqueue. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Data races in multiqueue

Also known asGHSA-r2x6-vrxx-jgv4RUSTSEC-2020-0143
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs65th percentile — riskier than 65% of all scored CVEsHighest risk
0.00%0.53%1.07%1.60%0.5%1.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-36463 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
🦀multiqueue

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

Affected versions of multiqueue unconditionally implemented Send for types used in queue implementations (InnerSend<RW, T>, InnerRecv<RW, T>, FutInnerSend<RW, T>, FutInnerRecv<RW, T>). This allows users to send non-Send types to other threads, which can lead to data race bugs or other undefined behavior.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🦀crates.iomultiqueueall versionsNo fix

Affected Products

1 product · 1 configurations
Application
multiqueuemultiqueue_project
≤ 2020-12-25
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in the multiqueue crate through 2020-12-25 for R…

rustsec.orgNVDAug 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    No patched version of multiqueue has shipped for CVE-2020-36463 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

Affected versions of multiqueue unconditionally implemented `Send` for types used in queue implementations (`InnerSend<RW, T>`, `InnerRecv<RW, T>`, `FutInnerSend<RW, T>`, `FutInnerRecv<RW, T>`). This allows users to send non-Send types to other threads, which can lead to data race bugs or other undefined behavior.
O3 Security · Impact-Aware SCA

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CVE-2020-36463: multiqueue (High 8.1)