CVE-2020-26302

Public Exploit

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.

Categories

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.15%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: arasatasaygin is.js
Published at:
Updated at:

References

Link Tags
https://securitylab.github.com/advisories/GHSL-2020-295-redos-is.js third party advisory exploit
https://github.com/arasatasaygin/is.js/issues/320 issue tracking third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-26302?
CVE-2020-26302 has been scored as a high severity vulnerability.
How to fix CVE-2020-26302?
To fix CVE-2020-26302, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26302 being actively exploited in the wild?
It is possible that CVE-2020-26302 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-26302?
CVE-2020-26302 affects arasatasaygin is.js.
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