CVE-2020-26302

2022-12-2200:00:00

CWE-400

GitHub_M

www.cve.org

is.js

library

vulnerability

regular expression denial of service

redos

codeql query

inefficient regular expressions

patch

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

36.4%

JSON

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.

CNA Affected

[
  {
    "vendor": "arasatasaygin",
    "product": "is.js",
    "versions": [
      {
        "version": "0.9.0",
        "status": "affected",
        "lessThanOrEqual": "0.9.0",
        "versionType": "custom"
      }
    ]
  }
]