The codehighlight extension bundles a vulnerable version of the 3rd party JavaScript component “prism” which is known to be vulnerable against Regular expression Denial of Service (ReDoS).

References

• brotkrueml/codehighlight@c43d46e
• https://github.com/FriendsOfPHP/security-advisories/blob/master/brotkrueml/codehighlight/2021-11-10-1.yaml
• https://typo3.org/security/advisory/typo3-ext-sa-2021-016