Resource exhaustion in Arasatasaygin Is.js
CVE-2020-26302
is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever." This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.009 (55.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Arasatasaygin Is.js — versions 0.9.0
- Is.js_project Is.js
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Exploit, Third Party Advisory)
- security-advisories@github.com (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2020-26302?
- CVE-2020-26302 is a high-severity vulnerability in Arasatasaygin Is.js, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-12-22.
- How severe is CVE-2020-26302?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-26302 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.