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.
Vulnerable Library - highlight.js8.4
JavaScript syntax highlighter with language auto-detection and zero dependencies.
Library home page: https://github.com/highlightjs/highlight.js.git
Vulnerable Source Files (1)
/job-dsl-api-viewer/build/webjars/highlightjs/8.4-4/highlight.js
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2020-26237
### Vulnerable Library - highlight.js8.4JavaScript syntax highlighter with language auto-detection and zero dependencies.
Library home page: https://github.com/highlightjs/highlight.js.git
Found in base branch: master
### Vulnerable Source Files (1)/job-dsl-api-viewer/build/webjars/highlightjs/8.4-4/highlight.js
### Vulnerability DetailsHighlight.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.
Publish Date: 2020-11-24
URL: CVE-2020-26237
### CVSS 3 Score Details (5.8)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: High - Privileges Required: Low - User Interaction: Required - Scope: Changed - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: High - Availability Impact: None
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://github.com/highlightjs/highlight.js/security/advisories/GHSA-vfrc-7r7c-w9mx
Release Date: 2020-11-24
Fix Resolution: 9.18.2, 10.1.2