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Not in CISA KEV
HIGH severity

CVE-2020-35893 — simple-slab

HIGH

CVE-2020-35893 is a high-severity (CVSS 7.5) CWE-193 vulnerability in simple-slab. A fix is available for simple-slab — see the affected versions and patch details below.

Out of bounds read in simple-slab

Also known asCVE-2020-35892GHSA-438g-fx34-4h9mGHSA-hqc8-j86x-2764RUSTSEC-2020-0039
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk
0.00%0.62%1.23%1.85%0.3%1.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-35893 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
🦀simple-slab

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

An issue was discovered in the simple-slab crate before 0.3.3 for Rust. remove() has an off-by-one error, causing memory leakage and a drop of uninitialized memory.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iosimple-slaball versions0.3.3cargo update -p simple-slab --precise 0.3.3

Affected Products

1 product · 1 configurations
Application
simple-slabsimple-slab_project
< 0.3.3
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 simple-slab, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update simple-slab to 0.3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-35893 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

An issue was discovered in the simple-slab crate before 0.3.3 for Rust. remove() has an off-by-one error, causing memory leakage and a drop of uninitialized memory.
O3 Security · Impact-Aware SCA

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CVE-2020-35893: simple-slab — Fixed in 0.3.3