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. Reference: https://github.com/highlightjs/highlight.js/security/advisories/GHSA-vfrc-7r7c-w9mx Upstream patches: https://github.com/highlightjs/highlight.js/pull/2636 https://github.com/highlightjs/highlight.js/commit/7241013ae011a585983e176ddc0489a7a52f6bb0
Created nodejs-highlight-js tracking bugs for this issue: Affects: epel-all [bug 1901664] Affects: fedora-all [bug 1901663]
External References: https://github.com/highlightjs/highlight.js/security/advisories/GHSA-vfrc-7r7c-w9mx
Statement: In Red Hat Virtualization, ovirt-engine-api-explorer uses a vulnerable version of highlight.js, however since release 4.4.3 ovirt-engine-api-explorer is obsoleted and no longer used.
This issue has been addressed in the following products: Red Hat Quay 3 Via RHSA-2021:3917 https://access.redhat.com/errata/RHSA-2021:3917
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-26237