CVE-2020-26302

Published Dec 23, 2022 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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
Type Values Removed Values Added
Metrics epss

{'score': 0.00171}

epss

{'score': 0.00183}

Type Values Removed Values Added
Metrics ssvc

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Apr 14, 2025, 2:37 PM
Reserved
Oct 1, 2020, 12:00 AM
Status
Modified
Published
Dec 22, 2022, 9:15 PM
Modified
Jun 17, 2026, 3:08 AM