Data races in concread

published 2020-11-13 5 y ago modified 2026-06-17 4 mo ago also GHSA-4xj5-vv9x-63jp , RUSTSEC-2020-0092 , EUVD-2021-1567

cvss: 4.7; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

An issue was discovered in the concread crate before 0.2.6 for Rust. Attackers can cause an ARCache<K,V> data race by sending types that do not implement Send/Sync.

Patch / fix

fixed in 2

crates.io concread 0.2.6
concread_project concread 0.2.6

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

rustsec.org https://rustsec.org/advisories/RUSTSEC-2020-0092.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	1.9	AV:L/AC:M/Au:N/C:N/I:N/A:P
OSV	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
crates.io	concread	<0.2.6 >=0.0.0-0, <0.2.6	0.2.6

Classification

Weakness

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

rustsec.org /advisories/RUSTSEC-2020-0092.html
web, exploit, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2020-35928
advisory
github.com /kanidm/concread/issues/48
web, report
github.com /kanidm/concread
package
crates.io /crates/concread
package

Sources

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