Description
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.
Published: 2022-12-23
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2023-2119 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.
Github GHSA Github GHSA GHSA-pvrw-g6fx-mcx2 is_js vulnerable to Regular Expression Denial of Service
History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00171}

epss

{'score': 0.00183}


Mon, 14 Apr 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Subscriptions

Is.js Project Is.js
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-04-14T14:37:16.925Z

Reserved: 2020-10-01T00:00:00.000Z

Link: CVE-2020-26302

cve-icon Vulnrichment

Updated: 2024-08-04T15:56:04.334Z

cve-icon NVD

Status : Modified

Published: 2022-12-22T21:15:08.877

Modified: 2024-11-21T05:19:48.677

Link: CVE-2020-26302

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses