Affected versions of this package 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.
Patches
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.
Workarounds
Patch your library
Manually patch your library to create null objects for both languages and aliases:
Tiny tiny release, just to fix the website incorrectly not listing Javascript
in the list of languages you could choose for a custom build. NPM and CDN
build should not have been affected so 10.3.1 is effectively the same as
10.3.2 for those builds.
If you made a custom build from the website with 10.3 or 10.3.1 you may
want to check and make sure it includes Javascript, and if not, build it again.
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Bumps highlight.js from 9.18.0 to 9.18.5. This update includes a security fix.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
Release notes
Sourced from highlight.js's releases.
Changelog
Sourced from highlight.js's changelog.
Commits
f54e96c
9.18.5c34318b
fix the link since i saw itd2e9bdd
include date of last releasef5e0645
typos and tweaks2e0e8ee
changelogdc45f7c
fix(livescript) fix potential catastrophic backtracking0a2624a
update readmed571b23
add warningec0bfd5
9.18.42a04835
bump v9.18.3Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase
.Dependabot commands and options
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