Regular Expression Denial of Service (ReDoS)

published 2021-06-08 5 y ago modified 2026-07-08 4 mo ago also GHSA-39q4-p535-c852 , EUVD-2021-1253

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits: 0; none known

The package locutus before 2.0.15 are vulnerable to Regular Expression Denial of Service (ReDoS) via the gopher_parsedir function.

Patch / fix

fixed in 2 links 3

npm locutus 2.0.15
n/a locutus 2.0.15

github.com/locutusjs/locutus@eb86332 commit
github.com/locutusjs/locutus#446 pull request
snyk.io/vuln/SNYK-JS-LOCUTUS-1090597 advisory

Exploit prediction

1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-JS-LOCUTUS-1090597 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	locutus	<2.0.15	2.0.15

Affected products

n/a locutus

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

github.com /locutusjs/locutus/pull/446
web, patch, third-party-advisory
github.com /locutusjs/locutus/commit/eb863321990e7e5514aa14f68b8d9978ece9e65e
web, patch, third-party-advisory
snyk.io /vuln/SNYK-JS-LOCUTUS-1090597
web, exploit, patch, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-23392
advisory

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