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Not in CISA KEV
HIGH severity

Data races in v9GHSA-pfjq-935c-4895

HIGH

GHSA-pfjq-935c-4895 is a high-severity (CVSS 8.1) CWE-362 vulnerability in v9. 1 public exploit reference exists, so weaponization risk is real. A fix is available for v9 — see the affected versions and patch details below.

Also known asCVE-2020-36447GHSA-3837-87vh-xq3wRUSTSEC-2020-0127
Published
Updated
Affected
1 pkg
Patched
1 / 1
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 CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk
0.00%0.52%1.04%1.56%0.3%1.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-pfjq-935c-4895 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
🦀v9

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 this crate unconditionally implement Sync for SyncRef<T>. This definition allows data races if &T is accessible through &SyncRef.

SyncRef<T> derives Clone and Debug, and the default implementations of those traits access &T by invoking T::clone() & T::fmt(). It is possible to create data races & undefined behavior by concurrently invoking SyncRef<T>::clone() or SyncRef<T>::fmt() from multiple threads with T: !Sync.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iov9all versions0.1.43cargo update -p v9 --precise 0.1.43

Affected Products

1 product · 1 configurations
Application
v9v9_project
≤ 0.1.41
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 v9 crate through 2020-12-18 for Rust. The…

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 v9, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update v9 to 0.1.43 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pfjq-935c-4895 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

Affected versions of this crate unconditionally implement `Sync` for `SyncRef<T>`. This definition allows data races if `&T` is accessible through `&SyncRef`. `SyncRef<T>` derives `Clone` and `Debug`, and the default implementations of those traits access `&T` by invoking `T::clone()` & `T::fmt()`. It is possible to create data races & undefined behavior by concurrently invoking `SyncRef<T>::clone()` or `SyncRef<T>::fmt()` from multiple threads with `T: !Sync`.
O3 Security · Impact-Aware SCA

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Data races in v9 (High 8.1)