An issue was discovered in the simple-slab crate before 0.3.3 for Rust.

published 2020-12-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-1753

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

simple-slab_project simple-slab 0.3.3

Exploit prediction

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-193 Off-by-one Error
CWE-401 Missing Release of Memory after Effective Lifetime
CWE-908 Use of Uninitialized Resource

References

rustsec.org /advisories/RUSTSEC-2020-0039.html
third-party-advisory

Sources

CVE List CVE-2020-35893
NVD CVE-2020-35893

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary