CVE-2020-26237

 

Published at: - 25-11-2020 12:15

Last modified: - 19-10-2022 03:49

Total changes: - 3

Description

Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object's prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/highlightjs/highlight.js/security/advisories/GHSA-vfrc-7r7c-w9mx
• https://www.npmjs.com/package/highlight.js
• https://github.com/highlightjs/highlight.js/pull/2636
• https://github.com/highlightjs/highlight.js/commit/7241013ae011a585983e176ddc0489a7a52f6bb0
• [debian-lts-announce] 20201230 [SECURITY] [DLA 2511-1] highlight.js security update-Mailing List, Third Party Advisory
• N/A-Third Party Advisory

 

Keywords

NVD

 

CVE-2020-26237

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures