Regular expression denial of service in url-regex

published 2020-06-04 6 y ago modified 2026-06-17 4 mo ago also GHSA-v4rh-8p82-6h5w , EUVD-2020-0514

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

all versions of url-regex are vulnerable to Regular Expression Denial of Service. An attacker providing a very long string in String.test can cause a Denial of Service.

Exploit prediction

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/kevva/url-regex/issues/70 referenced PoC, tagged "exploit" by a source, unverified
snyk.io https://snyk.io/vuln/SNYK-JS-URLREGEX-569472 referenced PoC, tagged "exploit" by a source, unverified

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	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C
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	url-regex	<=5.0.0	no fix listed

Affected products

n/a url-regex

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

github.com /kevva/url-regex/issues/70
web, exploit, third-party-advisory
snyk.io /vuln/SNYK-JS-URLREGEX-569472
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-7661
advisory
github.com /kevva/url-regex
package

Sources

CVE List CVE-2020-7661
GitHub Advisory GHSA-v4rh-8p82-6h5w
NVD CVE-2020-7661

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