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Not in CISA KEV
HIGH severity

Off-by-one error in simple-slabGHSA-hqc8-j86x-2764

HIGHFix: nathansizemore/simple-slab@5e0524c

GHSA-hqc8-j86x-2764 is a high-severity (CVSS 7.5) Out-of-bounds Read vulnerability in simple-slab. A fix is available for simple-slab — see the affected versions and patch details below.

Also known asCVE-2020-35892CVE-2020-35893GHSA-438g-fx34-4h9mRUSTSEC-2020-0039
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs74th percentile — riskier than 74% of all scored CVEsHighest risk
0.00%0.68%1.35%2.03%0.4%1.5%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-hqc8-j86x-2764 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 GHSA-hqc8-j86x-2764 is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

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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Off-by-one error in simple-slab (High 7.5)